Remove redundant revert-to-snapshot test option

This option is used to control how revert-to-snapshot
extra-spec is used when creating a share type for several tests,
but for the same tests, it is more appropriate to either not
create a share-type (thus use the default or "don't care"
behavior) or do so based on the value of
run_revert_to_snapshot_tests.

TrivialFix

Change-Id: Ie8a0030a896634eb8deaff17ea72371419eecdea
diff --git a/manila_tempest_tests/config.py b/manila_tempest_tests/config.py
index ee3dd42..2ba9ae5 100644
--- a/manila_tempest_tests/config.py
+++ b/manila_tempest_tests/config.py
@@ -104,6 +104,10 @@
                      "False if the driver being tested does not support "
                      "creating shares from snapshots."),
     cfg.BoolOpt("capability_revert_to_snapshot_support",
+                deprecated_for_removal=True,
+                deprecated_reason="Redundant configuration option. Please use "
+                                  "'run_revert_to_snapshot_tests' config "
+                                  "option instead.",
                 help="Defines extra spec that satisfies specific back end "
                      "capability called 'revert_to_snapshot_support' "
                      "and will be used for setting up custom share type. "