Add config option "production"

Related-Prod: PRODX-29973
Change-Id: Id0a6f408e8121d2f7a456df5925e3d105822ef19
diff --git a/tempest/config.py b/tempest/config.py
index 8589376..7254675 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -1367,6 +1367,11 @@
  $ stestr run --pdb TEST_ID
 or
  $ python -m testtools.run TEST_ID"""),
+    cfg.BoolOpt('production',
+                default=True,
+                help="The boolean flag to specify the type of environment. "
+                     "Skip tests that cannot be run in production. "
+                     "For example: create/delete TLDs in Designate tests."),
 ]
 
 _opts = [