Nuking the deprecated folder

Change-Id: I0e6b051ac4e911db963c755b1177479bb362852d
nova: fixes units tests failures when run using rpm

Was missing a critical step - python setup.py egg_info. This patch also fixes
the way git repo was cleaned. It now uses git clean -qdffx to cleanup.

Running tests in virtualenv uses (almost) the same command as running it with
rpm packages.

Change-Id: I824e2efb7feb5d3b0d978c11a86c6aa3e78b8032