Maintain extra read/write replicas during scale-up/down to maintain redundancy
Test updates
Test updates
Updated comments
Add log message
Only close TCP connections
Fix code coverage issue
Updates after review
Merge pull request #260 from Metaswitch/sprout_resilience

[Reviewer: Mike] Sprout resilience
Clarify comment on number of replicas for each vbucket
Merge pull request #262 from Metaswitch/sto495

[Reviewer Matt] Changes to memcached redundancy
Fix for memory leak
Correct indentation
Break up line
Merge pull request #265 from Metaswitch/sto294_memleak

[Reviewer: Matt] Fix for memory leak