RPM packages did not pass the tests because the centos prompt changed
and thus did not match the regexp anymore. We now explicitely specify
the prompt in our Dockerfiles to prevent such issues.
Remove installation of v8 requirements in package.dfdebian as this
is unnecessary for v7. This fixes a bug occuring during the installation
of openerp (precisely when installing reportlab dependencies), because
reportlab now requires a more recent version of pillow than 2.5.1.
Also use pip instead of /usr/local/bin/pip in test_tgz (package.py)
as pip script isn't installed there anymore.