Replace --non-interactive with -n

Older versions of sudo did not support the long option --non-interactive
but only -n.

Package built from this tag.
https://opensource.ok.is/repo/testing/rhel6/x86_64/pynag-0.9.1-1.git.4.51d0a4a.el6.noarch.rpm

Fixes the following condition:
```
In [4]: d = pynag.Control.daemon(nagios_bin="/usr/sbin/nagios", nagios_cfg="/etc/nagios/nagios.cfg", nagios_init="sudo /etc/init.d/nagios")

In [5]: d.status()
Out[5]: 1

In [6]: d.stdout
Out[6]: ''

In [7]: d.stderr
Out[7]: "sudo: invalid option -- '-'\nusage: sudo [-D level] -h | -K | -k | -V\nusage: sudo -v [-AknS] [-D level] [-g groupname|#gid] [-p prompt] [-u user\n            name|#uid]\nusage: sudo -l[l] [-AknS] [-D level] [-g groupname|#gid] [-p prompt] [-U user\n            name] [-u user name|#uid] [-g groupname|#gid] [command]\nusage: sudo [-AbEHknPS] [-r role] [-t type] [-C fd] [-D level] [-g\n            groupname|#gid] [-p prompt] [-u user name|#uid] [-g groupname|#gid]\n            [VAR=value] [-i|-s] [<command>]\nusage: sudo -e [-AknS] [-r role] [-t type] [-C fd] [-D level] [-g\n            groupname|#gid] [-p prompt] [-u user name|#uid] file ...\n"
```


After applying fix
```
In [2]: d = pynag.Control.daemon(nagios_bin="/usr/sbin/nagios", nagios_cfg="/etc/nagios/nagios.cfg", nagios_init="sudo /etc/init.d/nagios")

In [3]: d.status()
Out[3]: 0

In [4]: d.stdout
Out[4]: 'nagios (pid 28154) is running...\n'

In [5]: d.stderr
Out[5]: ''
```