set priority for processes

```
/usr/lib/python2.7/dist-packages/supervisor/options.py:295: UserWarning: Supervisord is running as root and it is searching for its configuration file in default locations (including its current working directory); you probably want to specify a "-c" argument specifying an absolute path to a configuration file for improved security.
  'Supervisord is running as root and it is searching '
2014-08-15 16:02:26,625 CRIT Supervisor running as root (no user in config file)
2014-08-15 16:02:26,625 WARN Included extra file "/etc/supervisor/conf.d/supervisord.conf" during parsing
2014-08-15 16:02:26,640 INFO RPC interface 'supervisor' initialized
2014-08-15 16:02:26,640 CRIT Server 'unix_http_server' running without any HTTP authentication checking
2014-08-15 16:02:26,640 INFO supervisord started with pid 6
2014-08-15 16:02:27,643 INFO spawned: 'strider' with pid 9
2014-08-15 16:02:27,644 INFO spawned: 'mongod' with pid 10
2014-08-15 16:02:27,645 INFO spawned: 'sshd' with pid 11
2014-08-15 16:02:28,904 INFO success: strider entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2014-08-15 16:02:28,904 INFO success: mongod entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2014-08-15 16:02:28,904 INFO success: sshd entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2014-08-15 16:02:46,209 INFO exited: strider (exit status 1; not expected)
2014-08-15 16:02:47,211 INFO spawned: 'strider' with pid 22
2014-08-15 16:02:47,886 INFO exited: strider (exit status 1; not expected)
2014-08-15 16:02:48,888 INFO spawned: 'strider' with pid 30
2014-08-15 16:02:49,572 INFO exited: strider (exit status 1; not expected)
2014-08-15 16:02:51,575 INFO spawned: 'strider' with pid 38
2014-08-15 16:02:52,267 INFO exited: strider (exit status 1; not expected)
2014-08-15 16:02:55,270 INFO spawned: 'strider' with pid 46
2014-08-15 16:02:55,968 INFO exited: strider (exit status 1; not expected)
2014-08-15 16:02:56,969 INFO gave up: strider entered FATAL state, too many start retries too quickly
```
this patch starts `mongod` first and then `strider`