skip fragile selenium spec

Change-Id: Iaf78301613915b2b0638f87aa25699a97c0a9997
Reviewed-on: https://gerrit.instructure.com/153096
Reviewed-by: Jacob Fugal <jacob@instructure.com>
Tested-by: Jenkins
Product-Review: Steven Burnett <sburnett@instructure.com>
QA-Review: Steven Burnett <sburnett@instructure.com>

spec/selenium/conversations/conversations_message_sending_spec.rb

@@ -209,6 +209,7 @@ describe "conversations new" do
       end
 
       it "should check and lock the bulk_message checkbox when over the max size", priority: "2", test_id: 206022 do
+        skip('COMMS-1164')
         conversations
         compose course: @course, subject: 'lockme', body: 'hallo!', send: false