Auto-upgrade hv_state_static and disk_state_static

These cluster parameters were introduced in 2da9f556
without being added to the parameters implicitly upgraded
if missing. This now causes problems when upgrading pre-2.6
clusters to 2.11 or later where this parameter is assumed
to be a dictionary. So add the implicit upgrade.
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Petr Pudlak <pudlak@google.com>

lib/objects.py

@@ -1719,6 +1719,12 @@ class Cluster(TaggableObject):
         raise errors.ConfigurationError(msg)
       self.ipolicy = FillIPolicy(constants.IPOLICY_DEFAULTS, self.ipolicy)
 
+    # hv_state_static added in 2.7
+    if self.hv_state_static is None:
+      self.hv_state_static = {}
+    if self.disk_state_static is None:
+      self.disk_state_static = {}
+
   @property
   def primary_hypervisor(self):
     """The first hypervisor is the primary.