Ensure polkit config is written for RHEL6 as well

Separate F18 polkit config and ensure it's written out for RHEL6, or
you get authentication errors with libvirt

Change-Id: Ib20fb0f4188e372fffe7736117ddbaf9c910195a
Grab upstream nodejs for RHEL6

RHEL6 has no nodejs in main packages or in EPEL.  The easiest way is
to just install the upstream binary version which works fine for the
very minimal usage by lesscss.

Change-Id: Ia35e7dbaf4c7add43797d6b7d0c846bab1cf0cb0
RHEL6 support rpms

Install some rpms required for operation on RHEL6.  Additionally,
remove some system packages that interfere with pip installs.

Change-Id: I273ce59d7bf066e73d524f61b8ad048599101dab