Fix uninstall error on debian (port to .SPEC)

Because of "set -e", we need to test if cf-* processes are running before
killing them, otherwise postrm fails and we cannot uninstall the package.
Merge pull request #140 from CedricCabessa/contrib

Fix uninstall error on debian (port to .SPEC)
Fixes  #4014: Use the right logrotate file on RHEL systems for rudder-server-root
Merge pull request #147 from Kegeruneku/bug_4014/int/4014_use_rhel_logrotate_in_rudder_server_root

Fixes  #4014: Use the right logrotate file on RHEL systems for rudder-se...
Fixes #4026 - Move the configuration file /etc/logrotate.d/rudder-server-root to /etc/logrotate.d/rudder in Debian way
Merge pull request #152 from nperron/bug_4026/int/fix_duplicate_of_conffile_of_logrotate

Fixes #4026 - Move the configuration file /etc/logrotate.d/rudder-server-root to /etc/logrotate.d/rudder in Debian way