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Serial kernel logging is a deprecated feature of Zircon and should not
be used anymore. This uses a long-running SSH invocation of "dlog"
to pull the logs over the wire. It works equally well on QEMU and on
devices.

Created a stream multiplexer using "poll" to merge the kernel log and
application log into a single stream, which is passed to the symbolizing
filter.

Modified the symbolizer regex rules to allow kernel log timestamps.
Kernel log timestamps can be omitted from the output, but they seem
to be helpful at visually distinguishing kernel output from app output.


Bug: 838671
Change-Id: Icd45f902a49983b4e4ee262de474d69fbef56860
Reviewed-on: https://chromium-review.googlesource.com/1038423
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556170}