Remove unused locking "context manager"

Class ods_db_lock is unused since August 2015.

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

daemons/dnssec/ipa-ods-exporter

@@ -20,7 +20,6 @@ from binascii import hexlify
 from datetime import datetime
 import dateutil.tz
 import dns.dnssec
-import fcntl
 from gssapi.exceptions import GSSError
 import logging
 import os
@@ -197,18 +196,6 @@ def ods2bind_timestamps(key_state, key_type, ods_times):
 
     return bind_times
 
-class ods_db_lock(object):
-    def __enter__(self):
-        self.f = open(ODS_DB_LOCK_PATH, 'w')
-        log.debug('waiting for lock %r', self.f)
-        fcntl.lockf(self.f, fcntl.LOCK_EX)
-        log.debug('acquired lock %r', self.f)
-
-    def __exit__(self, *args):
-        fcntl.lockf(self.f, fcntl.LOCK_UN)
-        log.debug('released lock %r', self.f)
-        self.f.close()
-
 def get_ldap_zone(ldap, dns_base, name):
     zone_names = ["%s." % name, name]