openshift.ks: Make CONF_CARTRIDGES=all default

Make the default value for CONF_CARTRIDGES be 'all' instead of 'standard'.

This commit fixes bug 1058640.
Merge pull request #282 from Miciah/bug-1058640-openshift.ks-make-CONF_CARTRIDGES-equals-all-default

openshift.ks: Make CONF_CARTRIDGES=all default