Enable tox.ini unit tests configuration

Previously, Jenkins did not run the unit tests.
Adds dependencies in requirements.txt.

Change-Id: Ic7d4c1a6be72025fe80f21fea4a738cacac70c76

requirements.txt

@@ -10,3 +10,6 @@ oslo.log>=1.2.0  # Apache-2.0
 oslo.serialization>=1.4.0  # Apache-2.0
 oslo.utils>=1.6.0  # Apache-2.0
 oslo.i18n>=1.5.0  # Apache-2.0
+
+eventlet>=0.16.1,!=0.17.0
+-e git+http://github.com/openstack/nova.git#egg=nova

tox.ini

@@ -8,7 +8,7 @@ usedevelop = True
 # tox is silly... these need to be separated by a newline....
 whitelist_externals = bash
                       find
-install_command = pip install -U --force-reinstall {opts} {packages}
+install_command = pip install --allow-external -U --force-reinstall {opts} {packages}
 # Note the hash seed is set to 0 until hyperv can be tested with a
 # random hash seed successfully.
 setenv = VIRTUAL_ENV={envdir}
@@ -19,6 +19,7 @@ deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
   find . -type f -name "*.pyc" -delete
+  python setup.py testr --slowest --testr-args='{posargs}'
 # there is also secret magic in pretty_tox.sh which lets you run in a fail only
 # mode. To do this define the TRACE_FAILONLY environmental variable.