Migrate to pbr

OpenStack uses pbr for setuptools/build and version releases. As
barbican looks towards incubation, migrate to being pbr based.

Change-Id: I3c7a389596ca579a5613ea98b21cdc6967e49cc7

tox.ini

@@ -5,16 +5,11 @@ envlist = pep8,pyflakes,py27
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHONPATH = {toxinidir}/etc/barbican
-deps = -r{toxinidir}/tools/pip-requires
-       -r{toxinidir}/tools/test-requires
-
-[testenv:pyflakes]
-deps = pyflakes
-commands = pyflakes barbican setup.py
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
 
 [testenv:pep8]
-deps = pep8
-commands = pep8 barbican --ignore=E711 --count --repeat --show-source --exclude=.tox setup.py
+commands = flake8
 
 [testenv:py27]
 commands = nosetests {posargs:--with-xcoverage --all-modules --cover-inclusive --traverse-namespace --with-xunit --cover-package=barbican}
@@ -22,8 +17,8 @@ commands = nosetests {posargs:--with-xcoverage --all-modules --cover-inclusive -
 [testenv:coverage]
 commands = coverage html {posargs:--include="*barbican*"}
 
-[testenv:hacking]
-commands = {toxinidir}/tools/hacking.sh
-
 [flake8]
+# E711 ignored because of sqlalchemy override of == None
+# H ignored because it's not H clean
+ignore = E711,H
 exclude = .git,.idea,.tox,bin,dist,debian,rpmbuild,tools,*.egg-info,*openstack/common