* 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.

SLE distributions and some architectures on SUSE do not
provide nano so building icinga2 would fail with nano as
BuildRequire.

Otherwise building the package fails because installed directories are
not referenced by RPM.

Signed-off-by: Markus Frosch <markus.frosch@icinga.com>

Since we ship a plugin now and the directory needs to be managed. Otherwise
building the package fails because installed directories are not
referenced by RPM.

Signed-off-by: Markus Frosch <markus.frosch@icinga.com>

It is required to log the deprecated warning of the classic ui package.

On pre systemd distributions `logger` is part of util-linux which should
always be installed I suppose, that's why I did not add an else clause.