wubloader/backfiller
Mike Lang f8d10dacdf Audit and fix all usage of dateutil
We wrap direct dateutil calls to handle two distinct cases:

* `common.dateutil.parse()`: We want to handle arbitrary timestamps including tz info,
then convert them to UTC.

This is used in HLS parsing, and for command line input for backfiller

* `common.dateutil.parse_utc_only()`: We want to only handle UTC timestamps,
but datetime.strptime isn't flexible enough (eg. can't handle missing fractional component).

This is used for restreamer request params.
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backfiller Audit and fix all usage of dateutil
Dockerfile Enable backdoor in all services, and add telnet to containers
setup.py reintroduced a start time for the backfiller; more logging