Enable random hash seeds

neutron-fwaas tests have been updated in order to support random hash
seed. It allows to remove PYTHONHASHSEED=0 in tox.ini and remove
hashtest tox environment.

Change-Id: I35f89a9ab6883f5fd600be804d75b67275e6629a
Partial-Bug: #1348818

tox.ini

@@ -4,10 +4,7 @@ minversion = 1.6
 skipsdist = True
 
 [testenv]
-# Note the hash seed is set to 0 until neutron can be tested with a
-# random hash seed successfully.
 setenv = VIRTUAL_ENV={envdir}
-         PYTHONHASHSEED=0
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 deps = -egit+https://git.openstack.org/openstack/neutron#egg=neutron
@@ -19,12 +16,6 @@ commands =
 # 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.
 
-[testenv:hashtest]
-# This is the same as default environment, but with a random PYTHONHASHSEED.
-# You can also specify a specific hashseed (for test repeatability) as follows:
-#   tox --hashseed 1235130571 -e hashtest
-setenv = VIRTUAL_ENV={envdir}
-
 [testenv:functional]
 setenv = OS_TEST_PATH=./neutron_fwaas/tests/functional
 commands =