Add flow-post-UUID hash to URL

Bug: 60638
Change-Id: I68e48146ef96d3b67618d628ed61d84184f60a29
(cherry picked from commit 15cfa37425624e299f9bddf0ee558d88a46bd3d0)
Mark API as a shim which will be replaced

Adjust the auto-generated API documentation to make it clear
to bot owners that the current API is temporary and should
not yet be developed against.

Change-Id: If85109a1f9d26e08ef58155b2cfc21d9798f2f91
(cherry picked from commit 10bbed3d199bb339034ed4ebaa2ef5e9272ebaf2)
Merge "Mark API as a shim which will be replaced" into wmf/1.23wmf12