runner: Continue using socket comms when getting an invalid packet

If a packet of invalid size is received, inject a message in the dump,
override result to warn, and continue grabbing packets.

Signed-off-by: Petri Latvala <petri.latvala@intel.com>
Cc: Arkadiusz Hiler <arek@hiler.eu>
Cc: Kamil Konieczny <kamil.konieczny@linux.intel.com>
Reviewed-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>