fix PHPdoc
add method to count groups on LDAP
LDAP Wizard: count users and groups with the power of paged search
consolidate requirement check
fix PHPdoc
Wizard: get really all groups from LDAP by power of Paged Search
make all this work in an early configuration state in the wizard by marking  the config active and ignoring the validation state.
simplify two methods a bit, because they are not used for group search anymore
remove unused vars; increase scrutinizer happiness
Merge pull request #9002 from owncloud/ldap_wizard_pagedsearch

LDAP Wizard: get correct total no of users, groups and complete list of groups on big setups