Replace hardcoded lock dir

This patch replaces the hardcoded ‘/var/lock/’ directory with one based on
LOCALSTATEDIR.

Reviewed-by: imsnah

lib/constants.py

@@ -34,6 +34,7 @@ EXPORT_VERSION = 0
 # file paths
 DATA_DIR = _autoconf.LOCALSTATEDIR + "/lib/ganeti"
 BDEV_CACHE_DIR = _autoconf.LOCALSTATEDIR + "/run/ganeti"
+LOCK_DIR = _autoconf.LOCALSTATEDIR + "/lock"
 CLUSTER_CONF_FILE = DATA_DIR + "/config.data"
 SSL_CERT_FILE = DATA_DIR + "/server.pem"
 WATCHER_STATEFILE = DATA_DIR + "/watcher.data"

lib/utils.py

@@ -39,6 +39,7 @@ import itertools
 
 from ganeti import logger
 from ganeti import errors
+from ganeti import constants
 
 
 _locksheld = []
@@ -95,7 +96,7 @@ class RunResult(object):
 
 def _GetLockFile(subsystem):
   """Compute the file name for a given lock name."""
-  return "/var/lock/ganeti_lock_%s" % subsystem
+  return "%s/ganeti_lock_%s" % (constants.LOCK_DIR, subsystem)
 
 
 def Lock(name, max_retries=None, debug=False):