- put tenant ID in URL when redirecting after logout if the tenant was
not the default one

Covers [BPO-379](https://bonitasoft.atlassian.net/browse/BPO-379)

Merge branch 'feat/force_locale_in_apps' of github.com:bonitasoft/bonita-web-sp into feat/force_locale_in_apps

- get locale from the browser in case there is no cookie or URL
parameter

Covers [PF-312](https://bonitasoft.atlassian.net/browse/PF-312)

- get locale in the homepage servlet the same way as in the apps pages

Covers [PF-312](https://bonitasoft.atlassian.net/browse/PF-312)

* remove unused import

* remove unused import

* remove unused import

* do not support web-extension deprecated code

- also add more tests on the parameters parsing:
They seems to be parsed correctly. The problem is more likely
engine-side or in serialization

Covers [BPO-436](https://bonitasoft.atlassian.net/browse/BPO-436)

- keep locale from URL when redirecting to the login page
- move test to right package

Covers [PF-312](https://bonitasoft.atlassian.net/browse/PF-312)

- use the right filter value (on PARENT_ACTIVITY_INSTANCE_ID)
- use the runSearch of AbstractHumanTaskDatastore

Covers [BPO-359](https://bonitasoft.atlassian.net/browse/BPO-359)

* Chore (remove dead code) remove internal SSO filter

- was used for studio integration in old versions

Covers [BPO-458](https://bonitasoft.atlassian.net/browse/BPO-458)
Covers [BPO-348](https://bonitasoft.atlassian.net/browse/BPO-348)

* fix (REST API) ClassCastException generated for bpm/userTask

- use the right filter value (enum instead of string)
- use the runSearch of AbstractHumanTaskDatastore

Covers [BPO-359](https://bonitasoft.atlassian.net/browse/BPO-359)

- keep locale from URL when redirecting to the login page

Covers [PF-312](https://bonitasoft.atlassian.net/browse/PF-312)

- get locale in the login jsp the same way as in the apps pages
- move LocaleUtils out of toolkit package

Covers [PF-312](https://bonitasoft.atlassian.net/browse/PF-312)

- Use locale from URL prior to checking the cookie
- Use locale from Browser if not in URL nor cookie

Covers [PF-312](https://bonitasoft.atlassian.net/browse/PF-312)

User can pass a new parameter `importPolicy` to provide the policy to use on import
By default policy provided is MERGE_DUPLICATES (default)

Relates tp [BR-322](https://bonitasoft.atlassian.net/browse/BR-322)