Add in missing translations for exceptions

Add in some missing translations.

TrivialFix

Change-Id: I696e880ef6d28f2a33d734ad35268c88cdc1aab3

neutron/agent/ovsdb/impl_idl.py

@@ -88,7 +88,7 @@ class Transaction(api.Transaction):
         attempts = 0
         while True:
             if attempts > 0 and self.timeout_exceeded():
-                raise RuntimeError("OVS transaction timed out")
+                raise RuntimeError(_("OVS transaction timed out"))
             attempts += 1
             # TODO(twilson) Make sure we don't loop longer than vsctl_timeout
             txn = idl.Transaction(self.api.idl)

neutron/common/utils.py

@@ -314,7 +314,7 @@ def is_cidr_host(cidr):
         plain IP addresses specifically to avoid ambiguity.
     """
     if '/' not in str(cidr):
-        raise ValueError("cidr doesn't contain a '/'")
+        raise ValueError(_("cidr doesn't contain a '/'"))
     net = netaddr.IPNetwork(cidr)
     if net.version == 4:
         return net.prefixlen == n_const.IPv4_BITS