[autotest] Include crash information in the status log.

This will include a line in the status log for each crash dmp file found.
Points to note:
    - INFO lines are only dumped into the status.log of the main server job
      not each status log of different jobs it might kick off.
    - We emit these dmp line whether or not we successfully symbolicate.

Also includes a link to the appropriate status.log in the bugs description.

TEST=Filed bugs, generated dmps.
eg status log: http://172.22.73.115/results/340470-beeps/172.22.75.218/status.log
eg bug filed:
https://code.google.com/p/autotest-bug-filing-test/issues/detail?id=1858#c2
BUG=chromium:319634

Change-Id: Ic0579163b954c3342b03edaf0c4fadd5b0fc634f
Reviewed-on: https://chromium-review.googlesource.com/176895
Reviewed-by: Prashanth B <beeps@chromium.org>
Tested-by: Prashanth B <beeps@chromium.org>
Commit-Queue: Prashanth B <beeps@chromium.org>
2 files changed