With the recent addition of pypowervm to upper-constraints, installs
of nova-powervm are now by default enforcing the version set there.
Since the master branch of nova-powervm depends on the develop
version of pypowervm, this causes installs to fail.
This changeset adds a wrapper script (tox_install.sh) that edits
the upper-constraints file and replaces the pypowervm version pin
then sets pypowervm to be installed from source instead.
Change-Id: Id8e117bc6a7b1b224a9e86e9b29821627adb51db
Nova has a bash script that uses the ostestr package to format
the output from tox in a 'pretty' format. It makes it much more
readable. pretty_tox.sh is pulled from Nova as-is and enabled
in tox.ini.
Change-Id: Ib90791b1333044c98e20444953d7ccab21cd62ba
