logging: remove object-specific loggers

Remove all object-specific loggers, with the exception of `Plugin.log`,
which is now deprecated. Replace affected logger calls with module-level
logger calls.

Deprecate object-specific loggers in `ipa_log_manager.get_logger`.

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipaserver/plugins/migration.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import logging
 import re
 from ldap import MOD_ADD
 from ldap import SCOPE_BASE, SCOPE_ONELEVEL, SCOPE_SUBTREE
@@ -132,6 +133,8 @@ for each user added plus a summary when the default user group is
 updated.
 """)
 
+logger = logging.getLogger(__name__)
+
 register = Registry()
 
 # USER MIGRATION CALLBACKS AND VARS
@@ -758,10 +761,9 @@ migration process might be incomplete\n''')
                     truncated = False
                     entries = []
             if truncated:
-                self.log.error(
-                    '%s: %s' % (
-                        ldap_obj.name, self.truncated_err_msg
-                    )
+                logger.error(
+                    '%s: %s',
+                    ldap_obj.name, self.truncated_err_msg
                 )
 
             blacklists = {}