Sync charm-helpers

Refreshes charm by including two additions to charmhelpers
which will unblock work on Epoxy.

Change-Id: Ief9377242ce9ef813dcf74d1d49f5895e96421bb

charmhelpers/contrib/network/ip.py

@@ -620,7 +620,7 @@ def get_relation_ip(interface, cidr_network=None):
         # Currently IPv6 has priority, eventually we want IPv6 to just be
         # another network space.
         assert_charm_supports_ipv6()
-        return get_ipv6_addr()[0]
+        return get_ipv6_addr(dynamic_only=False)[0]
     elif cidr_network:
         # If a specific CIDR network is passed get the address from that
         # network.

charmhelpers/contrib/openstack/context.py

@@ -25,7 +25,10 @@ import socket
 import time
 
 from base64 import b64decode
-from distutils.version import LooseVersion
+try:
+    from distutils.version import LooseVersion
+except ImportError:
+    from looseversion import LooseVersion
 from subprocess import (
     check_call,
     check_output,