bump spring version to 4.3.7.RELEASE. This goes along with https://github.com/bonitasoft/bonita-engine-sp/pull/548 since we now share same dependency management

Relates to [BS-16380](https://bonitasoft.atlassian.net/browse/BS-16380)

Add IE=11 and IE=edge as X-UA-Compatible meta in html entry pages.

Otherwise IE11 is falling back to IE10 compatibility mode.
For some reasons IE11 version 11.0.40 in IE10 compatibility mode displays the Portal using only half of the screen height.
It is not the case with other IE11 version updates.

fixes[BS-16409](https://bonitasoft.atlassian.net/browse/BS-16409)

Prepare spring bump version since spring-test 4.3.7.RELEASE require junit >= 4.12

- Bump junit version to 4.12
- Bump mockito version to 1.10.19
- Bump powermock version to 1.6.6
- Bump gwtmockito version to 1.1.6

Relates to [BS-16380](https://bonitasoft.atlassian.net/browse/BS-16380)

Following the import of engine dependencies, the slf4j dependency
version property was removed as it is taken from the engine dependency
management However this doesn't work inside jetty plugin when not
specifying the version

Relates to [BS-16290](https://bonitasoft.atlassian.net/browse/BS-16290)

Transitively, bonita-web is now pulling javax servlet-api in version 3.0.1
instead of 2.5
This commit fixes the version by ensuring all versions are now aligned.
It also updates the Http servlet request/response mocks to adapt to 3.0.1

Closes [BS-16441](https://bonitasoft.atlassian.net/browse/BS-16441)

Closes [BS-16350](https://bonitasoft.atlassian.net/browse/BS-16350)

when a cookie already exists on a different path than the one expected,
we need to invalidate it. And Since there is no way of knowing the path
as it is not sent server-side (getPath return null) we can only
invalidate any cookie found. In addition this commit clean the cookie
value to avoid misunderstanding the response header.

Covers [BS-16241](https://bonitasoft.atlassian.net/browse/BS-16241)

by ProcessAPI.addProcessComment()

 Relates to [BS-16407](https://bonitasoft.atlassian.net/browse/BS-16407)

- Retrieve tenant from cookie when not set

Covers [BS-16374](https://bonitasoft.atlassian.net/browse/BS-16374)

* lib was used but not declared as dependency
* transitive dependency httpcore is also required until engine updates also to httpClient 4.5.2

Part of [BS-16290](https://bonitasoft.atlassian.net/browse/BS-16290)

This allow to use same version for libs that are either needed by bonita engine and either needed by bonita web.
So when updating a lib used by these two projects, you need to update the version once.

Set frontend-maven-plugin version to 1.3
Was not set so last version was chosen.

Declare guava as an explicit tests dependency in server module since it is used somewhere in some test

+ Add FINE-level Log messages when truncation needed for the date to be valid

Remove comment in po files, this allow us to have a better understanding of what has changed in po files
in github history and while the PR that update translation is created.

The main issue here is whenever the code change, translation context change so updating a po file has a lot of unwanted changes in po files

Closes[/BS-16286](https://bonitasoft.atlassian.net/browse/BS-16286)

Display the original string when translation key is present but translation is empty

Closes [BS-15651](https://bonitasoft.atlassian.net/browse/BS-15651)

* check for nul values before converting
* add tests

Closes [BS-16274](https://bonitasoft.atlassian.net/browse/BS-16274)

- since 7.3 theme resources are accessed in a relative way using the URL
../theme. As a result, the path of the images declared in the CSS is
relative to the css directory in the theme so resources are not
retrieved from the war portal/ directory anymore.
We cannot remove them from there, though, because old forms look&feels
might still use them.
The solution is to just copy the two images we use inside the
appropriate directory in the theme.

Covers [BS-16006](https://bonitasoft.atlassian.net/browse/BS-16006)

Form V6 URL could be used to list all process instance variable values
by using a wrong ID (autogenerated form)

Covers [BS-15949](https://bonitasoft.atlassian.net/browse/BS-15949)

Covers [BS-15868](https://bonitasoft.atlassian.net/browse/BS-15868)

This method from Singleton class I18n was static, so could be called before
static singleton _INSTANCE was created, causing tests to fail, but not all
the time: depending on the order of the tests being run by Junit, the test
failed or not. Now this is not order-dependent.

* Revert "Feat/wildfly-restlet-patch (#108)"

This reverts commit ed2c1d9f43ca2de21d4ca87a94818f526b70fb8f.

* chore(restlet) upgrade restlet version to 2.3.9

- including restlet/restlet-framework-java/pull/1229 to avoid patching restlet
- follow restlet changes (preventing to set the Content-range as we want)