Restore sync-dir and sync-file in python

Revert I449eba1 and add sync-file-old and sync-dir-old as a temporary
safety net for syncs that have a problem with the new python
implementations.

Change-Id: Idf7674160b2befa2291d32f3c9e7059e0218232f
Always send debug logs to udp2log server

Send debug level logging output to the udp2log server without requiring
the deployer to use the `--verbose` command argument. This will allow
better diagnosis of deploy issues from the log files and logstash
without unnecessarily cluttering the deployer's console. Note that this
will not automatically enable the most verbose logging possible. The
`--verbose` flag is still needed to trigger verbose logging in the l10n
update process.

Change-Id: Idfdc0b9652b14ad86f963ffedd64478b7dc188b7