Cleanup build scripting.

There's a lot of old-school stuff in here that won't be necessary
for the new ops deployment process, so let's simplify it.
Update for latest cornice/mozsvc changes.
Backport sync2.0 code to speak sync1.5 protocol.
Update loadtests to use loads rather than funkload
Merge pull request #8 from mozilla-services/rfk/sync-1.5

Bug 960876 - server implementation of sync1.5 protocol; r=telliott