HYD-4673 Test failure: selenium, test_users, test_superuser_powers: element is not attached to the page document
HYD-4673 Test failure: selenium, test_users, test_superuser_powers: element is not attached to the page document

While waiting for the user detail dialog to dissapear it
dissappeared between looking it up and checking its
visibility raising an exception

We can explictly ignore this exception in our WebDriverWait.

  - update WebDriverWait to ignore StaleElementReferenceException.

Change-Id: Ifd90fca58daf5edfc2eca24098415d06350399da
Signed-off-by: Joe Grund <5a0004131f5af71cc30270f318d2c30ba7aaa99a@intel.com>
Reviewed-on: http://review.whamcloud.com/15893
Tested-by: Jenkins
Tested-by: Chroma Test User <a0b98b2ff5154776fa24760ef410655af7a8b56c@intel.com>
Reviewed-by: Wayne Kenneth Seymour III <91a819736b2ae022828fb01b73df051e4864c94b@intel.com>
Reviewed-by: Will Johnson <12b9e8082b7fae5ba694976591ab55465e35debd@intel.com>

intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre