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This change fixes bisect-builds.py so that it runs under Python 3 (while
still supporting Python 2). The changes are:

- Don't import httplib (unsupported but also unused)
- Import urllib.request as urllib on Python 3
- Don't use 16L syntax for 16
- Use input instead of raw_input on Python 3
- Convert integer division results to integer
- Use is_alive instead of IsAlive
- Use except Exception _as_ e instead of a comma

The new code needs to use two conditionals with the rest of the fixes
still working fine in Python 2.

Bug: 941669
Change-Id: I34cd995225233f3f97008c7e07e0537b4683c48f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498954
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#820882}