Get group members in case-sensitive since the uidAttribute value will be used for the page name.
use the resulted list of group members for accessing the case-sensitive values. this is needed in order to have access to the actual uidAttribute value when creating/searching for the user profile
refactor #splitUsersList since the uidAttribute is the value of an entry set, there is no need to split the dn to get it
refactor the initialization of XWikiLDAPUtils in order to be sure that the attributes are set each time
Get group members in case-sensitive since the uidAttribute value will be used for the page name.