ConfigWriter: remove _ReleaseLock

Remove empty function _ReleaseLock and all its calls. Since we only
have one configwriter per cluster the locking needs to cover all the
data in the object, and not just the file contents. Locking in
ConfigWriter will be handled using the ganeti locking library.

Reviewed-by: iustinp

lib/config.py

@@ -93,7 +93,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
     prefix = self._config_data.cluster.mac_prefix
     all_macs = self._AllMACs()
     retries = 64
@@ -117,7 +116,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
     all_macs = self._AllMACs()
     return mac in all_macs
 
@@ -126,7 +124,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
     lvnames = set()
     for instance in self._config_data.instances.values():
       node_data = instance.MapLVsByNode()
@@ -172,7 +169,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
 
     result = []
     for instance in self._config_data.instances.values():
@@ -185,7 +181,6 @@ class ConfigWriter:
     """Stub verify function.
     """
     self._OpenConfig()
-    self._ReleaseLock()
 
     result = []
     seen_macs = []
@@ -259,7 +254,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
     return self._config_data.cluster.tcpudp_port_pool.copy()
 
   def AllocatePort(self):
@@ -294,7 +288,6 @@ class ConfigWriter:
     Returns: rsa hostkey
     """
     self._OpenConfig()
-    self._ReleaseLock()
     return self._config_data.cluster.rsahostkeypub
 
   def AddInstance(self, instance):
@@ -393,7 +386,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
 
     return self._config_data.instances.keys()
 
@@ -402,7 +394,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
 
     return utils.MatchNameComponent(short_name,
                                     self._config_data.instances.keys())
@@ -421,7 +412,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
 
     if instance_name not in self._config_data.instances:
       return None
@@ -455,7 +445,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
 
     return utils.MatchNameComponent(short_name,
                                     self._config_data.nodes.keys())
@@ -469,7 +458,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
 
     if node_name not in self._config_data.nodes:
       return None
@@ -481,14 +469,12 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
     return self._config_data.nodes.keys()
 
   def DumpConfig(self):
     """Return the entire configuration of the cluster.
     """
     self._OpenConfig()
-    self._ReleaseLock()
     return self._config_data
 
   def _BumpSerialNo(self):
@@ -537,10 +523,6 @@ class ConfigWriter:
     self._config_size = st.st_size
     self._config_inode = st.st_ino
 
-  def _ReleaseLock(self):
-    """xxxx
-    """
-
   def _DistributeConfig(self):
     """Distribute the configuration to the other nodes.
 
@@ -634,7 +616,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
     return self._config_data.cluster.volume_group_name
 
   def SetVGName(self, vg_name):
@@ -650,7 +631,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
     return self._config_data.cluster.default_bridge
 
   def GetMACPrefix(self):
@@ -658,7 +638,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
     return self._config_data.cluster.mac_prefix
 
   def GetClusterInfo(self):
@@ -669,7 +648,6 @@ class ConfigWriter:
 
     """
     self._OpenConfig()
-    self._ReleaseLock()
 
     return self._config_data.cluster