ipaldap: merge IPAdmin to LDAPClient
    
    * move IPAdmin methods to LDAPClient
    * add extra arguments (cacert, sasl_nocanon) to LDAPClient.__init__()
    * add host, port, _protocol to LDAPClient (parsed from ldap_uri)
    * create get_ldap_uri() method to create ldap_uri from former
        IPAdmin.__init__() arguments
    * replace IPAdmin with LDAPClient + get_ldap_uri()
    * remove ununsed function argument hostname from
        enable_replication_version_checking()
    
    https://fedorahosted.org/freeipa/ticket/6461
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>