Finish conversion to stestr

In I565cd2593982a1b5c8c43cf394301c56e24b9b29 a half conversion
was performed to switch to stestr, but the dependency information
was not actually updated. Since ostestr is just a wrapper around
stestr, we don't need testrepository anymore. Also since we're
now calling stestr directly we can stop depending on the ostestr
wrapper. Also move hacking dependency into the pep8 tox environment
as it isn't needed for tests

Change-Id: Ia60c018b8691fd175468bdad81e604cbbc0e1b74

test-requirements.txt

@@ -1,7 +1,5 @@
 mock
-hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 coverage>=3.6 # Apache-2.0
-testrepository>=0.0.18
+stestr!=2.3.0  # Apache-2.0
 testtools>=1.4.0 # MIT
-os-testr>=0.4.1 # Apache-2.0
 ddt

tox.ini

@@ -2,21 +2,22 @@
 envlist = py35,py34,py27,pep8
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          PYTHONDONTWRITEBYTECODE = 1
-         LANGUAGE=en_US
          LC_ALL=en_US.UTF-8
          TESTS_DIR=./proliantutils/tests/
-deps = -r{toxinidir}/test-requirements.txt
+deps =
+    -r{toxinidir}/requirements.txt
+    -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
 
 [testenv:pep8]
 basepython = python2.7
 deps =
-    -r{toxinidir}/requirements.txt
-    -r{toxinidir}/test-requirements.txt
+    hacking!=0.13.0,<0.14,>=0.12.0
 commands =
     flake8 proliantutils