Add special serial smoke option

We want smoketests to be parallel by default (for grenade etc), but that won't work
for neutron, so add a special case. Since we don't want to break
anything making this switch, it has to be done in 3 steps:

1) this patch
2) make neutron use smoke-serial
3) change smoke to be parallel

Note this is a backport to grizzly so the parallel options are not being
added, we are just maintaining serialized testing on the grizzly branch.

Change-Id: I03ded120c0b496026e39f14f6715624a91ac7558

Author: jogo

tox.ini

@@ -41,6 +41,19 @@ commands =
    nosetests --logging-format '%(asctime)-15s %(message)s' --with-xunit -sv --attr=type=smoke --xunit-file=nosetests-smoke.xml tempest
 
 
+[testenv:smoke-serial]
+sitepackages = True
+setenv = VIRTUAL_ENV={envdir}
+         NOSE_WITH_OPENSTACK=1
+         NOSE_OPENSTACK_COLOR=1
+         NOSE_OPENSTACK_RED=15
+         NOSE_OPENSTACK_YELLOW=3
+         NOSE_OPENSTACK_SHOW_ELAPSED=1
+         NOSE_OPENSTACK_STDOUT=1
+commands =
+   nosetests --logging-format '%(asctime)-15s %(message)s' --with-xunit -sv --attr=type=smoke --xunit-file=nosetests-smoke.xml tempest
+
+
 [testenv:coverage]
 sitepackages = True
 setenv = VIRTUAL_ENV={envdir}