Fixed few UI tests

Started monitoring UI tests from nightly.. Lot of tests are failing because of recent changes in UI locators.

Fixed:test_remove_filter:: updated locator
Fixed: activation_key tests as per the changes in api code for CV promote/publish
Fixed locators
Fixed: Failing GPGKey tests while searching the key
Maybe we have an enhancement opportunity here: `ContentViewVersion` shouldn't have a helper method to fetch the content views?