Revert "Revert "Swift: configure Ceilometer when it is enabled""

Commit 6650fda680310e71b5dda7764bf4033f670d90f0 is no longer needed:
https://review.openstack.org/#/c/46048 has been merged.

This reverts commit 6650fda680310e71b5dda7764bf4033f670d90f0.

Change-Id: I47d28a292667eb8ece2061c0ef19c7c925e5747c
Fix handling of pip and virtualenv on openSUSE

openSUSE's python-virtualenv rpm depends on the python-pip rpm, but
tools/install_pip.sh prefers to deinstall the latter (if installed) and
install pip directly from upstream source instead.

This deinstallation of python-pip will break if attempted via rpm -e,
since rpm does not transitively remove dependents (in this case
python-virtualenv).  In contrast, "zypper rm" does, so we switch to
that.

It is safe to remove the python-virtualenv package, since stack.sh will
install virtualenv via pip instead.

Change-Id: I5bc23de0f2de2e3940c4be3b76b7c0634836239b
Merge "Fix handling of pip and virtualenv on openSUSE"
Merge "Revert "Revert "Swift: configure Ceilometer when it is enabled"""