Changes:
* install ca-certificates, so "git clone" doesn't fail
* checkout specific commits (the most recent ones right now), so we
will get the same code every time we build the container and the
patches won't fail to apply in the future
* rebase patch "disable the use of scheduler priorities and mlockall"
on top of master (I couldn't find the commit it was supposed to be
based on)
* delete obsolete patch that fixed compilation
Change-Id: I7cd647684b983384f419b5cfbea0f8dfc7fee70e