Fix nagios support on RHEL#330

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NVitanovic wants to merge 7 commits intoatomia:masterfrom

NVitanovic:fix-nagios-centos-support

Commits on Mar 12, 2018

fix nrpe install on rhel based systems (centos, cloudlinux etc.)
Nikola Vitanovic
committed

Commits on Mar 13, 2018

Fixed discrepancies with nagios config on rhel and debian
Nikola Vitanovic
committed
Fixed discrepancies on rhel and debian
Nikola Vitanovic
committed
Moved checks to ERB file and added downcase just to be sure
Nikola Vitanovic
committed

Commits on Mar 14, 2018

Fix check_process and added role for CL env
Nikola Vitanovic
committed

Commits on Mar 15, 2018

Added automatic adding of nrpe to sudoers
Nikola Vitanovic
committed

Commits on Mar 16, 2018

Enable NRPE on startup
Nikola Vitanovic
committed