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Previously runner scripts were capturing debug logs from test instance
only after successful SSH connection to the test device. This made it
hard to debug issues that break system boot (mainly after SDK updates).
This CL sets SSH connect timeout to 5 seconds (previously there was no
timeout) and updates Target._WaitUntilReady() to capture logs with
loglistener while waiting for SSH connection. The logs are printed to
the output after second failed connection attempt.

Change-Id: I4b57d3a13f3baa520d9e7bdd08a6e6a9236e7ecc
Reviewed-on: https://chromium-review.googlesource.com/1148939
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578894}