Merge pull request #2234 from YanhuiMa/bug_after_load_vm

timedrift_check_clock_offset: add guest agent link for rhel8 guest

qemu/tests/cfg/timedrift_check_clock_offset.cfg

@@ -76,6 +76,10 @@
             clocksource = "kvm-clock"
             ppc64le,ppc64:
                 clocksource = "timebase"
+            #only for rhel8,virt module stream is rhel or 8.1,8.2,8.3 and so on
+            virt_module_stream = rhel
+            # Please update your file share web server url before test
+            download_root_url = <your_server_url>
             gagent_name = "org.qemu.guest_agent.0"
             gagent_install_cmd = "yum install -y qemu-guest-agent"
             gagent_start_cmd = "systemctl start qemu-guest-agent"