[Misc] Initialize the LDAP configuration with the SSL settings coming from the Active Directory application

application-activedirectory#84 : The number of imported groups by the 'LDAP Group Import' scheduler job is limited to 1000
* Use paginated search when searching importable groups from the LDAP server

application-activedirectory#82: NullPointerException returned by one group update makes the whole groups synchronization fail

* Handle XWikiLDAPException when getting group members so the whole import does not fail if there is one failure.

application-activedirectory#82: NullPointerException returned by one group update makes the whole groups synchronization fail

* Add a null check when using XWikiLDAPUtils#getGroupMembers(ldapGroupDN, context)

* Add better request ID to separate LDAP group imports from other jobs

* This code allows to search in LDAP using "begin with" in both users and groups searches. An option in the search UI (checkbox) allows to make a slower "contains" search.
* It has been found that on a large LDAP the "contains" search can be way to slow.
* Made default for user search to search in all object classes

* #72 Updating a group should not save each user one by one

* #71 Update group takes the wrong group name on second click in the same screen