Remove cassandra connection error event from the homestead events
Take latest cpp-common
Merge pull request #134 from Metaswitch/sto831

[Reviewer: Rob] More co-req changes for cassandra store refactor
Refactor cache to use CassandraStore. WIP (does not compile)
Make cache transactions compile
Make DiameterTransaction match CacheTransaction
Get cache UTs to compile
Make handler UTs compile
UT fixes
More UT fixes
Change HTTP Handlers->Tasks
Move cassandra test utilities to cpp-common
Rename HTTP Controllers->Handlers
Fix wrongly named controllers
Get Handler->Task and Controller->Handler renaming working
Correct Indenting
New cpp-common ref
Take latest cpp-common and remove files moved to there
Merge pull request #136 from Metaswitch/update_cpp_common

[No review required] Take latest cpp-common and remove files moved to there
Exclude some test code from coverage, as well as cassandra_store.cpp (which is jointly tested with memento).