Make sure the agent is restarted on update

Author: Remi Hakim

Diff for: packaging/datadog-agent-base-rpm/posttrans

@@ -2,4 +2,5 @@ getent group dd-agent >/dev/null || groupadd -r dd-agent
 getent passwd dd-agent >/dev/null || \
     useradd -r -M -g dd-agent -d /usr/share/datadog/agent -s /bin/sh \
     -c "Datadog Agent" dd-agent
+/etc/init.d/datadog-agent restart
 exit 0