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>

ipaserver/install/ipa_restore.py

@@ -435,10 +435,8 @@ class Restore(admintool.AdminTool):
         if self._conn is not None:
             return self._conn
 
-        self._conn = ipaldap.IPAdmin(host=api.env.host,
-                                   ldapi=True,
-                                   protocol='ldapi',
-                                   realm=api.env.realm)
+        ldap_uri = ipaldap.get_ldap_uri(protocol='ldapi', realm=api.env.realm)
+        self._conn = ipaldap.LDAPClient(ldap_uri)
 
         try:
             self._conn.external_bind()