Fix up formatting and sed usage for heapster deploy.

Also, 'sed -i' isn't supported well across BSD and GNU versions of sed.  See http://stackoverflow.com/questions/5694228/sed-in-place-flag-that-works-both-on-mac-bsd-and-linux.  And we were editing files that were checked in to git with a password.  Instead, do this with class sed redirection in a temp dir.

Fixes #2400.