Fix Bono/Sprout handling of failed SAS connection
Add 30 second timeout to SAS connection
Firewall against failing to open a log file
Improve logging of HTTP connection errors
Discard incoming non-OPTIONS requests if queue is too large
Add latency statistics for HSS and XDM
Improve logging and retry behaviour on Homestead (and Homer) lookup failures
Remove rough overload control code (moved to an experimental branch
Merge pull request #202 from Metaswitch/issue178

[Reviewer Andy] Issue178
Convert MemcachedStore to use thread local storage instead of libmemcached pooling
Add view tracing
Use virtual_bucket distribution
Switch back to memcached
Fix up defaulting of memcached_servers
Add memcached redundancy support
Fix read repair CAS resync
Sort memcached server list so all sprout nodes see the same list
Add locking around view
Change memcached_servers to memstores to bring in sync with GR changes
memstore, not memstores!