Use modern GPL license tag
Logrotate.conf doesn't need execution rights
Add log directory to icinga2-common

RPMLint complains if logrotate is used without including the log directory in the package.
Use default group instead of zero for %{name}.service
Don't copy INSTALL documentation to system docs

The INSTALL documentation is not relevant after installation, especially
if packages are used.

This does prevent a rpmlint warning.
Recommend logrotate in icinga2-common

Since we install a logrotate configuration file it does make sense to at
least recommend the installation of logrotate.
Excluding this addition to SUSE distributions since Recommends is not
supported elsewhere.
Description should be longer than the summary

This fixes a rpmlint warning.
Remove .gitignore files from package

This commit can be reversed as soon as there are upgrade files in the
schema upgrade directories.
Remove redundant requirements for SUSE distributions
Activate systemd on SUSE distributions
Reduce redunancies in spec file

Remove redundant differences between SUSE and RHEL distributions.
Remove redundant mysql requirement

The mysql dependencies are recognized automatically during building.
Remove obsolete pgsqllib require on SUSE distributions
Use permission verfication scripts on SUSE distributions
Fix cgi lib path on x64 SUSE systems