Issue #41: Remove policycorutils RPMs from blacklist

RHEL 7 has policycorutils that no longer have an semanage user bug that
caused us to blacklist certain version of policycorutils. We can safely
remove them from the blacklist.
Issue #37: Add newest lorax source to packages

This fixes issue #37 which would cause a build to fail if a build was
previously executed, and the artifacts from that build were not deleted.
Issue #37: Patch lorax source

Before we were patching lorax directly on the system with a patch in
support. Now we patch the source, and then install the newest RPM.

We will also drop the old patch from support.
Issue #37: Build and install our own lorax in bootstrap

Remove lorax from list of RPMs to install using RHN in bootstrap and
the top Makefile. We now install the newest lorax as part of the
bootstrap process.
Issue #37: Add more optional packages needed by lorax

Added at-spi, tigervnc-server-module, and bitmap-fangsongti-fonts to
bootstrap. These packages will no longer spew out an error during a
build because they were missing. There is still and error for
*-redhat-upgrade-dracut, but this is documented in
https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=1065557.
Since this package is not yet available, but will soon be added, it
should not be removed.

Removed rpm-ostree from the lorax templates. We don't use it and it
silences an error during the build.

Run createrepo each time we bootstrap on the opt repo. It's possible
that we add a new RPM to the OPT_PACKAGES list. If creatrepo doesn't
need to do anything, it takes about 1 second to run. This "slowdown" is
worth it to make sure that the opt repo is always up to date with the
newest RPMs.