remove pid file in drain

[#167384192]

Author: Ben Fuller

jobs/loggregator_trafficcontroller/templates/drain.erb

@@ -1,5 +1,6 @@
 #!/bin/bash
 
 killall trafficcontroller
+rm /var/vcap/sys/run/bpm/loggregator_trafficcontroller/loggregator_trafficcontroller.pid
 echo 5
 exit 0

jobs/reverse_log_proxy/templates/drain.erb

@@ -1,5 +1,6 @@
 #!/bin/bash
 
 killall rlp
+rm /var/vcap/sys/run/bpm/reverse_log_proxy/reverse_log_proxy.pid
 echo 60
 exit 0