openSUSE's ccache package doesn't include symlinks to enable ccache
for gcc by default, so we set them up manually.
Change-Id: I79dbe814ff2dfad8158fb1f06d68cc07eae19a41
Some of the tripleo image elements rely useradd a for creating a group
with the same name as the user that is added. On openSUSE is feature
is turned off by default. So enable it here.
Change-Id: I120067e5e522dc6e704e7f09b724d60dee0c7f22