When AM releases a container, RM removes allocation tags before it is released by NM

User leverages PC with allocation tags to avoid port conflicts between apps, we found sometimes they still get port conflicts. This is a similar issue like YARN-4148. Because RM immediately removes allocation tags once AM#allocate asks to release a container, however container on NM has some delay until it actually gets killed and released the port. We should let RM remove allocation tags AFTER NM confirms the containers are released.