Only specify enum_server if one is configured for this environment
Reduce TTL for cluster DNS records to 60 seconds
Merge pull request #54 from Metaswitch/issue191

[Reviewer: Mike] Only specify enum_server if one is configured for this environment
Ensure DNS records are updated if TTL is wrong
Merge pull request #55 from Metaswitch/faster_scale_up

[Reviewer Matt] Faster scale up
Add chef scripts to configure geo-redundancy (by setting gr_environments in environment)
Move to memcached, permit missing ENUM servers and install snmpd
Reinstate security group rules (incorrectly committed as part of previous commit)
Fix non-geo-redundant configurations
Don't restart sprout after re-clustering (as before)
Merge branch 'geo_redundancy_to_merge' into geo_redundancy_to_merge_2

Conflicts:
	cookbooks/clearwater/recipes/cluster.rb
Fix merge
Merge pull request #61 from Metaswitch/geo_redundancy_to_merge_2

[Reviewer: Mike] Geo redundancy support