app-mgmt-test: Handle ERR_CANCELLED in PortStartFail

The kernel now returns ERR_CANCELLED when trying to connect
to an app that has failed to start. This fixes the PortStartFail
test to check for that error instead of trying to connect a
second time.

Bug: 198698206
Change-Id: I4e1ab3c2c06aaeb961deaa4d4583ebff2ee657fe
1 file changed