collabora container must be restarted to open documents from nextcloud

### Steps to reproduce
1. start up a fresh collabora container
2. have a nextcloud instance already configured to use it
3. try to open a document
4. Fail
5. restart the container
6. try to open a document
7. succeed!

### Expected behaviour
Step 4 succeeds

### Actual behaviour
Error message in nextcloud, and this output from collabora:

> collabora    | Generating RSA private key, 2048 bit long modulus
collabora    | ..........+++
collabora    | ...+++
collabora    | e is 65537 (0x10001)
collabora    | Generating RSA private key, 2048 bit long modulus
collabora    | ................+++
collabora    | ....................+++
collabora    | e is 65537 (0x10001)
collabora    | Signature ok
collabora    | subject=/C=DE/ST=BW/L=Stuttgart/O=Dummy Authority/CN=localhost
collabora    | Getting CA Private Key
collabora    | loolforkit version details: 2.0.4 - 2.0.4
collabora    | office version details: { "ProductName": "Collabora Office", "ProductVersion": "5.1", "ProductExtension": ".10.21", "BuildId": "e91d2c2d59b035e40bdefac5fe06fb210180ed86" }
collabora    | wsd-00026-0027 20:15:40.553692 [ client_req_hdl ] WRN  WOPI host did not pass optional access_token_ttl| wsd/FileServer.cpp:255
collabora    | wsd-00026-0029 20:15:41.550065 [ client_ws_0001 ] WRN  Missing JSON property [HidePrintOption]| wsd/Storage.cpp:353
collabora    | wsd-00026-0029 20:15:41.550235 [ client_ws_0001 ] WRN  Missing JSON property [HideSaveOption]| wsd/Storage.cpp:353
collabora    | wsd-00026-0029 20:15:41.550318 [ client_ws_0001 ] WRN  Missing JSON property [HideExportOption]| wsd/Storage.cpp:353
collabora    | wsd-00026-0029 20:15:41.550423 [ client_ws_0001 ] WRN  Missing JSON property [EnableOwnerTermination]| wsd/Storage.cpp:353
collabora    | wsd-00026-0029 20:15:41.550506 [ client_ws_0001 ] WRN  Missing JSON property [DisablePrint]| wsd/Storage.cpp:353
collabora    | wsd-00026-0029 20:15:41.550584 [ client_ws_0001 ] WRN  Missing JSON property [DisableExport]| wsd/Storage.cpp:353
collabora    | wsd-00026-0029 20:15:41.550656 [ client_ws_0001 ] WRN  Missing JSON property [DisableCopy]| wsd/Storage.cpp:353
collabora    | kit-00084-0172 20:15:42.194272 [ lok_handler ] ERR  Failed to load: file:///user/docs/84/how%20it%20works%201.docx, error: loadComponentFromURL returned an empty reference| kit/Kit.cpp:1149
collabora    | kit-00084-0172 20:15:42.194451 [ lok_handler ] ERR  Failed to get LoKitDocument instance.| kit/ChildSession.cpp:334
collabora    | wsd-00026-0029 20:15:42.290033 [ client_ws_0001 ] WRN  SocketProcessor [client_ws_0001]: Connection closed.| common/IoUtil.cpp:100


### Server configuration
**Operating system**:
Debian 8

**Web server:**
Apache 2,4

**Database:**
Mariadb 10

**PHP version:**
5.6.30

**Nextcloud version:** (see Nextcloud admin page)
11.0.2

**Updated from an older Nextcloud/ownCloud or fresh install:**
Fresh

**Where did you install Nextcloud from:**
Tarball

**Signing status:**
<details>
<summary>Signing status</summary>

```
No errors have been found.
```
</details>

**List of activated apps:**
<details>
<summary>App list</summary>

```
Enabled:
  - calendar: 1.5.2
  - comments: 1.1.0
  - contacts: 1.5.3
  - dav: 1.1.1
  - deck: 0.1.2
  - direct_menu: 0.10.1
  - federatedfilesharing: 1.1.1
  - federation: 1.1.1
  - files: 1.6.1
  - files_accesscontrol: 1.1.2
  - files_automatedtagging: 1.1.1
  - files_pdfviewer: 1.0.1
  - files_retention: 1.0.1
  - files_sharing: 1.1.1
  - files_texteditor: 2.2
  - files_trashbin: 1.1.0
  - files_versions: 1.4.0
  - files_videoplayer: 1.0.0
  - firstrunwizard: 2.0
  - gallery: 16.0.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.0.0
  - nextcloud_announcements: 1.0
  - notifications: 1.0.1
  - ojsxc: 3.1.1
  - password_policy: 1.1.0
  - provisioning_api: 1.1.0
  - richdocuments: 1.1.25
  - serverinfo: 1.1.1
  - sharebymail: 1.0.1
  - spreedme: 0.3.8
  - systemtags: 1.1.3
  - tasks: 0.9.5
  - theming: 1.1.1
  - twofactor_backupcodes: 1.0.0
  - twofactor_totp: 1.1.0
  - workflowengine: 1.1.1
Disabled:
  - activity
  - admin_audit
  - bookmarks
  - encryption
  - external
  - files_external
  - keeweb
  - onlyoffice
  - rainloop
  - spreed
  - survey_client
```
</details>

**The content of config/config.php:**
<details>
<summary>Config report</summary>

```
<?php
$CONFIG = array (
  'passwordsalt' => 'xxxxxxx',
  'secret' => 'xxxxxxx',
  'trusted_domains' => 
  array (
    0 => 'xxxxxxx',
  ),
  'datadirectory' => '/opt/nextcloud/data',
  'overwrite.cli.url' => 'http://localhost',
  'dbtype' => 'mysql',
  'version' => '11.0.2.7',
  'dbname' => 'nextcloud',
  'dbhost' => 'mariadb',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'xxxxxxx',
  'dbpassword' => 'xxxxxxx',
  'logtimezone' => 'UTC',
  'installed' => true,
  'instanceid' => 'xxxxxxx',
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'redis',
    'port' => 6379,
  ),
  'htaccess.RewriteBase' => '/',
  'maintenance' => false,
  'loglevel' => 2,
  'theme' => '',
  'mail_smtpmode' => 'php',
  'mail_from_address' => 'noreply',
  'mail_domain' => 'xxxxxxx',
);

```
</details>

**Are you using external storage, if yes which one:** no

**Are you using encryption:** no

**Are you using an external user-backend, if yes which one:** no

### Client configuration
**Browser:**
Chrome 57.x
**Operating system:**
Fedora 25

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collabora container must be restarted to open documents from nextcloud #36

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Uh oh!

collabora container must be restarted to open documents from nextcloud #36

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