Add facilities for logs flushing.
Merge branch 'master' of github.com:youtube/vitess

Conflicts:
	go/cmd/vttablet/vttablet.go
Add custom flag function to support both Go and Google flags
Merge branch 'master' of github.com:youtube/vitess
Refactor and further librarify vttablet.
tabletserver.IsHealthy.
Rewrite queryservice_test so that it doesn't use the old querylog.
Native support for Int, Float, String (add Get)
Do not write the debug querylog when the streaming query log is available.
Remove unused logging libraries: logfile and relog.
Merge branch 'master' into sougou-work