Agent should not cache repo info to avoid situations of incorrect repo

The Agent reads the repos and caches. If you restart the Agent, the Agent will install the repo again.

When attempting a Local Repository install, in the case where you forget to edit repoinfo.xml or incorrectly edit repoinfo.xml, the Agent would have cached the incorrect info. So restarting and clearing the Ambari Server won't help if you are trying to correct the repo info. You need to restart the Agents to clear the incorrect repo info.