Support active<>passive HA using config map locking and initialized gating.

[timothysc]

This is neat-o work I did upstream that you can leverage. Poke me when you're ready.

[timothysc]

This may not make it this labs week, but it'll be fun.

[youyongsong]

hello, how is the progress of this ha supporting?

[chuckha]

I noticed I have been assigned for two years and do not plan on working on this, my priorities lie elsewhere. Please feel free to take this issue if you'd like to.