Add large-ops option to tox

Add new option because we want to keep separate tox jobs for each
jenkins job.

Part of the regression test for bug 1199433.

Change-Id: I4e59d79d3ce3a9621243a81b7da5d9c3abaf1d6f
diff --git a/tox.ini b/tox.ini
index ea27b92..05db5be 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,6 +34,13 @@
 commands =
   sh tools/pretty_tox_serial.sh '(?=.*\[.*\bslow\b.*\])(^tempest\.(api|scenario)\.orchestration) {posargs}'
 
+[testenv:large-ops]
+sitepackages = True
+setenv = VIRTUAL_ENV={envdir}
+commands =
+  python setup.py testr --slowest --testr-args='tempest.scenario.test_large_ops {posargs}'
+
+
 [testenv:py26-full]
 sitepackages = True
 setenv = VIRTUAL_ENV={envdir}