Add scripts to increment single fm/kernel keys. For firmware and kernel key increment testing we need to be able to rev only particular keys and verify an autoupdate works. BUG=None TEST=Ran it BRANCH=None Change-Id: Ic814480b4bf8fbc994132fcd7ba519c3be9b0ccd Reviewed-on: https://gerrit.chromium.org/gerrit/32458 Reviewed-by: Mike Frysinger <[email protected]> Commit-Ready: Kris Rambish <[email protected]> Tested-by: Kris Rambish <[email protected]>