[dv/push-pull-agent] reset in monitor
[dv/push-pull-agent] reset in monitor

This PR fixes a small issue when reset is issued in the middle of a pull
device request, then if no ack is issued (because interrupted by reset),
then the monitor will be stuck at waiting for ack.

Signed-off-by: Cindy Chen <399ad771a111eac8923348b1e2af093034e5d4f1@google.com>

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