Switch Sprout to use memcached ASCII protocol
Sprout now depends on infinispan, not memcached
Change sprout startup to use local Infinispan store
Tested statistics accumulator code - needs a little tidy-up before review
Merge branch 'dev' into sto218
Code tidy-up
Merge pull request #186 from Metaswitch/sto218

[Reviewer Mike] Infinispan sprout registration store
Fix valgrind tests
Merge pull request #187 from Metaswitch/fix_valgrind

[No review required] Fix valgrind tests