Bug 820802 - Disable some telephony tests to try and fix the battery almost perma-oranges, a=test-only

dom/telephony/test/marionette/manifest.ini

@@ -31,9 +31,13 @@ disabled = Bug 806138
 [test_outgoing_already_held.js]
 [test_outgoing_answer_local_hangup.js]
 [test_outgoing_remote_hangup_held.js]
+disabled = Bug 820802
 [test_incoming_already_held.js]
+disabled = Bug 820802
 [test_swap_held_and_active.js]
+disabled = Bug 820802
 [test_incoming_onstatechange.js]
+disabled = Bug 820802
 [test_outgoing_onstatechange.js]
 [test_redundant_operations.js]
 disabled = Bug 821927