Fix command docker ps showing issue. (sonic-net#3791)

What I did
Fix docker ps command showing image ID instead of name:tag issue.
It only impacts dhcp-relay, dhcp-server and macsec.

How I did it
render_ctx will provide name:tag and j2 template will use it instead of ID.

Author: liushilongbuaa

sonic_package_manager/service_creator/creator.py

@@ -282,6 +282,7 @@ def generate_container_mgmt(self, package: Package):
         render_ctx = {
             'docker_container_name': name,
             'docker_image_id': image_id,
+            'docker_image_name': package.entry.repository,
             'docker_image_run_opt': run_opt,
             'sonic_asic_platform': sonic_asic_platform
         }