[Autotest] Improves bug reporter search capabilities.

'Html-Escapes' the query marker and performs an exact search,
if this returns inconclusively eliminates the reason field
alltogether and grabs the super set of related issues, going
through each one looking for an exact match.

BUG=None
TEST=Took strings that confuse the reporter into creating
     different issues today and made sure they dupe.

Change-Id: Ib2b4bef59beaaab96eb985bddbe826e3b878c8e4
Reviewed-on: https://gerrit.chromium.org/gerrit/46107
Tested-by: Prashanth Balasubramanian <beeps@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Commit-Queue: Prashanth Balasubramanian <beeps@chromium.org>
1 file changed