memcache as child of vttablet, phase 1.
rowcache as child, phase 2
rowcache as child, a few fixes
Fix tests
Merge branch 'master' of github.com:youtube/vitess into new-rowcache-child
Fix deadlock bug: stop update stream after stopping invalidator
Merge pull request #12 from youtube/new-rowcache-child

rowcache: memcached as child of vttablet/vtocc