CRAS: test_client - Print plugged state of iodevs.
CRAS: test_client - Print plugged state of iodevs.

Add the plugged state to the output of '--dump_server_info'

BUG=none
TEST='cras_test_client --dump_server_info', check plugged state.

Change-Id: I00ed7a0502d54979b78270b612747fe09af3c769
Signed-off-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/30380
Reviewed-by: Olof Johansson <13dc431ca3b0f062f888def8f8ec4662ec608f7d@chromium.org>

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