Use testr setuptools commands.

Replace the embedded shell scripts with setuptools commands provided by
upstream. Cleans up a few warnings that this cause tox to show.

Change-Id: I9eb47142eafb6ed038b358b94984462ca1632542

.coveragerc

@@ -1,6 +1,7 @@
 [run]
 branch = True
-omit = /usr*,setup.py,*egg*,.venv/*,.tox/*,nova/tests/*
+source = nova
+omit = nova/tests/*,DynamicallyCompiledCheetahTemplate.py
 
 [report]
 ignore-errors = True

tools/test-requires

@@ -11,5 +11,5 @@ pep8==1.3.3
 pylint==0.25.2
 python-subunit
 sphinx>=1.1.2
-testrepository>=0.0.8
+testrepository>=0.0.12
 testtools>=0.9.22

tox.ini

@@ -8,8 +8,7 @@ setenv = VIRTUAL_ENV={envdir}
          LC_ALL=C
 deps = -r{toxinidir}/tools/pip-requires
        -r{toxinidir}/tools/test-requires
-commands = bash -c 'if [ ! -d ./.testrepository ] ; then testr init ; fi'
-           bash -c 'testr run --parallel {posargs} ; RET=$? ; echo "Slowest Tests" ; testr slowest && exit $RET'
+commands = python setup.py testr --slowest --testr-args='{posargs}'
 
 [tox:jenkins]
 sitepackages = True
@@ -34,13 +33,11 @@ deps = pyflakes
 commands = python tools/flakes.py nova
 
 [testenv:cover]
-# Need to omit DynamicallyCompiledCheetahTemplate.py from coverage because
-# it ceases to exist post test run. Also do not run test_coverage_ext tests
-# while gathering coverage as those tests conflict with coverage.
-setenv = OMIT=--omit=DynamicallyCompiledCheetahTemplate.py
-         PYTHON=coverage run --source nova --parallel-mode
-commands = bash -c 'if [ ! -d ./.testrepository ] ; then testr init ; fi'
-           bash -c 'testr run --parallel \^\(\?\!\.\*test_coverage_ext\)\.\*\$ ; RET=$? ; coverage combine ; coverage html -d ./cover $OMIT && exit $RET'
+# Also do not run test_coverage_ext tests while gathering coverage as those
+# tests conflict with coverage.
+commands =
+  python setup.py testr --coverage \
+    --testr-args='^(?!.*test_coverage_ext).*$'
 
 [testenv:venv]
 commands = {posargs}