Using wrangler.ctx in a lot more places.
Merge branch 'master' into replication
Merge pull request #245 from youtube/replication

Using wrangler.ctx in a lot more places.
Another pass at context clean up.
Merge pull request #249 from youtube/replication

Another pass at context clean up.
Replacing zkocc with vtgate in this test.
Merge pull request #250 from youtube/replication

Replacing zkocc with vtgate in this test.
Allow trace plugins to be registered from outside the package.

Fixes #248
update doc to reflect changes in vtctl
Merge pull request #252 from yaoshengzhe/fix_doc_vtctl

update doc to reflect zk path changes in vtctl
Merge pull request #251 from youtube/trace

Allow trace plugins to be registered from outside the package.
Merge branch 'master' into etcdtopo-test
Wait for both mysql.sock and mysqlctl.sock.

I switched from SSD to RAM disk and it exposed a race condition.
When launching mysqlctld in the background, we need to wait for both
mysql.sock and mysqlctl.sock to show up before we try to connect.