disable need for nrpe_commands, avoid definition of plugin_dir in yaml

[arnimf]

default of 'plugin_dir' does not work with debian, unless it is defined in the 'Debian' section

'nrpe.cfg' does not compile if 'nrpe_command' is not defined in yaml-file. But it should compile even if you have no nrpe_command defined.

It would also solve problems mentioned in issue #28

[wwentland]

Please note that I submitted #32 yesterday to fix the problem with nrpe_commands. Could you rebase your branch against master, please?

I guess that defining plugin_dir for Debian still makes a lot of sense though.

[arnimf]

I did the rebase. So, remains the issue with the plugin_dir.

[wwentland]

Ta!

[thenewwazoo]

Does a nagios-nrpe-server installation without having NRPE commands defined even make sense?