devinstall_test: catch SSHConnectionError during VM startup

SSHConnectionError has recently been added to remote_access to
distinguish shell command error and ssh connection
error. devinstall_test needs to catch this new exception.

BUG=chromium:339135
TEST=None

Change-Id: I0304c9130c677dab26bc7eaa5c6eea8c18694938
Reviewed-on: https://chromium-review.googlesource.com/184461
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Commit-Queue: Yu-Ju Hong <yjhong@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
1 file changed