Rename requires files to standard names.

Rename tools/pip-requires to requirements.txt and tools/test-requires
    to test-requirements.txt. These are standard files, and tools in the
    general world are growing intelligence about them.

    adding test-requirements.txt to quantumclient/openstack/common/setup.py per review instructions.

Change-Id: Ibf991b400bfbeb4222216649901586e01a0255b1
Fixes: bug #1179008

tox.ini

@@ -6,8 +6,8 @@ setenv = VIRTUAL_ENV={envdir}
          LANG=en_US.UTF-8
          LANGUAGE=en_US:en
          LC_ALL=C
-deps = -r{toxinidir}/tools/pip-requires
-       -r{toxinidir}/tools/test-requires
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
 commands = python setup.py testr --testr-args='{posargs}'
 
 [testenv:pep8]