openshift.sh: modify premium cartridge selection

Premium cartridges (currently jbosseap, fuse, and amq) are those that
require an extra subscription beyond the standard OSE one. This being
the case, and because oo-install does not yet have a method of selecting
appropriate subscription and cartridge sets per host, we should not
default to trying to install premium cartridges; it makes oo-install
unusable for real customer subscriptions without premium carts. Once
oo-install gains this ability, it will still be better to explicitly
specify that premium cartridges are desired.

The CONF_CARTRIDGES parameter now defaults to "standard" (which means
none of the premium cartridges) and there are some new aliases available.
Premium cartridges can be specified with this parameter or installed
later. Unfortunately this *does* mean trial installations will end up
without JBoss EAP by default and need to add it if desired.

Note: at this point, fuse/amq cartridges are not actually released
anywhere, so are only available via "extra" yum repos.
Merge pull request #468 from sosiouxme/enterprise-2.2

openshift.sh: modify premium cartridge selection