Recommend related packages on SUSE distributions

These packages are installed by default but they are not required so
there is no error if they are missing.

This should make the installation of Icinga2 more user friendly on SUSE
distributions.

refs #6920

icinga2.spec

@@ -83,7 +83,8 @@ Group:        Applications/System
 
 Requires: python-%{name} = %{version}
 %if "%{_vendor}" == "suse"
-PreReq: permissions
+PreReq:        permissions
+Recommends:    monitoring-plugins
 %endif
 BuildRequires: openssl-devel
 BuildRequires: gcc-c++
@@ -167,6 +168,9 @@ Group:        Applications/System
 BuildRequires: %{apachename}
 Requires:     %{apachename}
 Requires:     %{name} = %{version}-%{release}
+%if "%{_vendor}" == "suse"
+Recommends:   icinga-www
+%endif
 Provides:     icinga-classicui-config
 Conflicts:    icinga-gui-config