Fix test case spikeGenFunc, use fixed connection.
Fix test case spikeGenFunc, use fixed connection.

UCI-CARL/CARLsim4,UCI-CARL/CARLsim4,UCI-CARL/CARLsim4,UCI-CARL/CARLsim4,UCI-CARL/CARLsim4,UCI-CARL/CARLsim4