COOK-2247 pkgs should be a list of Strings

pkgs.each doesn't work on a String, it must be a list of Strings
package[tar,make] added client_source->bash[compile-nagios-plugins]'
make and tar needed for building on centos, rhel, and others
Change all references to nagios-nrpe-server in the init to use service_name attribute

This fixes a long standing bug where NRPE couldn't be stopped on RHEL
systems because the killproc uses the nagios-nrpe-server name
Merge pull request #98 from hh/patch-2

COOK-2247 pkgs should be a list of Strings
Merge pull request #100 from tas50/COOK-2134

COOK-2134: Correctly use nrpe vs. nagios-nrpe-server when necessary