C* PID file should be readable by mere users

automaton@i-175d594e9:~$ service cassandra status
 * Cassandra is not running
automaton@i-175d594e9:~$ sudo service cassandra status
 * Cassandra is running
automaton@i-175d594e9:~$ ls -la /var/run/cassandra/
ls: cannot open directory /var/run/cassandra/: Permission denied
automaton@i-175d594e9:~$ sudo ls -la /var/run/cassandra/
total 4
drwxr-x---  2 cassandra cassandra  60 Aug 30 01:21 .
drwxr-xr-x 15 root      root      700 Aug 30 01:21 ..
-rw-r--r--  1 cassandra cassandra   4 Aug 30 01:21 cassandra.pid