Add previous GCU tests to kvm daily test (#5020)

Summary:
Add previous Generic Configer Updater tests into kvm test suite

What is the motivation for this PR?
Move GCU test into kvm daily test

How did you do it?
Add GCU test case into kvmtest.sh

How did you verify/test it?
Run test of sonic-mgmt/tests/generic_config_updater/*.py on KVM

tests/kvmtest.sh

@@ -152,9 +152,15 @@ test_t0() {
       container_checker/test_container_checker.py \
       process_monitoring/test_critical_process_monitoring.py \
       system_health/test_system_status.py \
+      generic_config_updater/test_aaa.py \
+      generic_config_updater/test_bgpl.py \
+      generic_config_updater/test_bgp_prefix.py \
+      generic_config_updater/test_bgp_speaker.py \
+      generic_config_updater/test_dhcp_relay.py \
       generic_config_updater/test_lo_interface.py \
-      generic_config_updater/test_vlan_interface.py \
       generic_config_updater/test_portchannel_interface.py \
+      generic_config_updater/test_syslog.py \
+      generic_config_updater/test_vlan_interface.py \
       show_techsupport/test_techsupport_no_secret.py"
 
       pushd $SONIC_MGMT_DIR/tests