Remove Fedora/libvirt workaround

An updated libvirt package to address [1] is in Fedora 20 now, so we
don't need this work-around.  Modify the comments of the other part of
the work-around (restart of services) and link to the most relevant
bug

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1098376

Change-Id: I47fba7b4f273162c2af1e37902a512041449750b
Add flag for ceilometer tests

Added flag for enable or disable tests for ceilometer
feature of fast work with databases

Change-Id: If68c2b733358a98f56265b70c31366e6a9120dfa
make get-pip.py download failures more clear

curl dying ends up being a really unclear failure condition, and
hard to fingerprint in the gate. We should make this much more
explicit when we die.

Also, don't trust the upstream filename, because all the rest of
our logic would break if it changes anyway.

Change-Id: Ibc2a96b33471d24c597af0d7af896fb10523156f
Update setuptools to latest for .dist-info support

Support for .dist-info directories was added in setuptools 0.6.28.

At this moment, Ubuntu Precise 12.04 provides setuptools 0.6.24
which is too old for our needs.

Six is installed from wheel which uses the .dist-info directory.
For six to be found, we need to install setuptools >= 0.6.28.

Updating setuptools to the latest version using pip will provide use
the needed version to make six discoverable.

Closes-bug: #1326811
Change-Id: I761d0aeb2b8b593cee38d512afc8fed6a2d1fe37
Update again and retry a failed package install

On ubuntu, if we run into an error installing the package, it can be
because of transient upstream errors with repo sync state. Although
retrying the update won't fix it all of the time, it's low cost enough
to be worth a try before we totally give up.

Related-bug: 1286818
Change-Id: I522ac0d0bd8f82dc98f386c89f66c2b743efa525
Fix Apache site config handling on Fedora

Allow enable/disable_apache_sites() on Fedora to gracefully fail if the
config is not present.  This is primarily an issue when the config from
a previous run is not completely cleaned out (unstack.sh vs clean.sh).

Make APACHE_CONFIG_DIR fully qualified and overrideable in local.conf.

Also fix Horizon's handling of its Apache config file to be removed
in clean.sh.

Change-Id: I78a5de579dd3b02fa2e4e7e00ac0aabe71b531ad
Merge "Remove Fedora/libvirt workaround"
Merge "Add flag for ceilometer tests"
Merge "Update setuptools to latest for .dist-info support"
Merge "Enable horizon on Fedoras"
Merge "Fix Apache site config handling on Fedora"
Merge "Update again and retry a failed package install"
Merge "make get-pip.py download failures more clear"
Merge branch 'cinder-backends' into dt-test
Merge branch 'usb-prereq' into dt-test
Merge branch 'conf-tempest' into dt-test