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 the bono.<domain> DNS entry
* Make clustering not happen on quiescing nodes
* Make knife dns records create ignore quiescing nodes
* Make knife deployment resize give an error if there are quiescing nodes (and it's not a rezise that will simply unquiesce them)
Fix up previous commit - make DNS records actually ignore quiescing nodes
Quiescing infrastructure works, but doesn't actually run the SSH commands and needs refactoring
Checkpointing at sensible state
Improving error messages
Remove debug logs, fix syntax error
Ignore SIPp boxes when working out if everything is quiesced
UI improvements
Code review markups
Fix up argument numbers
Add --force parameter
Merge pull request #62 from Metaswitch/scaling_down

{Reviewer: Andy} Scaling down
Merge pull request #60 from Metaswitch/bono-cluster-dns

Reviewer Mike - Add the bono.<domain> DNS entry
Merge master in to memcached_redundancy