gbproxy: Fix TC_bvc_reset_sig_from_sgsn

The port receive operation only considers the first message in the
queue. We need to drain unrelated status/reset messages, such as those
from PTP BVCs, otherwise the test never completes and times out.

Change-Id: I1f2c76ae9bdc0267bfca60536e321fe88530803c
Related: SYS#5115 OS#4518
1 file changed