We do not need the UUIDs for our toolchain, remove them.
They cause huge changes with each import with no benefit for us.
Note: Sphinx 1.3 by default disables UUID generation but we're using an
older Sphinx version for building, thus have to do this manually.
Change-Id: I3f3e910c5b2a2d03a3f04b67015526c3b7e77ddb