Builds needed for:
* SLES 12
* Fedora 27

* Improve RPM groups
* Improve grammar in RPM subpackage descriptions
* Remove redundant %clean section from rpm spec
* Fix service.d dir which was not referenced by any package
* Use sle_version instead of deprecated leap_version
  see https://en.opensuse.org/openSUSE:Build_Service_cross_distribution_howto#leap_version_macro_.28deprecated.29
* Also add systemd limits file to openSUSE Tumbleweed
* Documentation should not hard-require the program
  as it is technically "usable" without it.

Dropping policyhelp for Fedora 27, was only needed on Fedora < 20, and EL < 7

See https://fedoraproject.org/wiki/SELinux_Policy_Modules_Packaging_Draft

refs #61

refs #61

Builds needed for:
* SLES 12
* Fedora 27

* Improve RPM groups
* Improve grammar in RPM subpackage descriptions
* Remove redundant %clean section from rpm spec
* Fix service.d dir which was not referenced by any package
* Use sle_version instead of deprecated leap_version
  see https://en.opensuse.org/openSUSE:Build_Service_cross_distribution_howto#leap_version_macro_.28deprecated.29
* Also add systemd limits file to openSUSE Tumbleweed
* Documentation should not hard-require the program
  as it is technically "usable" without it.

Dropping policyhelp for Fedora 27, was only needed on Fedora < 20, and EL < 7

See https://fedoraproject.org/wiki/SELinux_Policy_Modules_Packaging_Draft

refs #61

refs #61

This reverts commit ae1762ee501224c5e76a88cf1a1da7a043a67c46.

This will be removed with 2.8

Also see:
* https://github.com/Icinga/icinga2/issues/5611
* https://github.com/Icinga/icinga2/pull/5612

Also see:
* https://github.com/Icinga/icinga2/issues/5611
* https://github.com/Icinga/icinga2/pull/5612

Even on an old SLES11 SP4 vim seems to have the site
directory with a similar structure so we do not need
the complicated setup.