Remove obsolete Group tag

References: https://fedoraproject.org/wiki/Changes/Remove_Group_Tag

libcgroup.spec

@@ -7,7 +7,6 @@ Name: libcgroup
 Version: 0.41
 Release: 20%{?dist}
 License: LGPLv2+
-Group: Development/Libraries
 URL: http://libcg.sourceforge.net/
 Source0: http://downloads.sourceforge.net/libcg/%{name}-%{version}.tar.bz2
 Source1: cgconfig.service
@@ -44,7 +43,6 @@ administrate and monitor control groups and the associated controllers.
 
 %package tools
 Summary: Command-line utility programs, services and daemons for libcgroup
-Group: System Environment/Base
 Requires: %{name}%{?_isa} = %{version}-%{release}
 # needed for Delegate property in cgconfig.service
 Requires: systemd >= 217-0.2
@@ -55,7 +53,6 @@ manipulating control groups using the libcgroup library.
 
 %package pam
 Summary: A Pluggable Authentication Module for libcgroup
-Group: System Environment/Base
 Requires: %{name}%{?_isa} = %{version}-%{release}
 
 %description pam
@@ -64,7 +61,6 @@ processes to pre-configured control group.
 
 %package devel
 Summary: Development libraries to develop applications that utilize control groups
-Group: Development/Libraries
 Requires: %{name}%{?_isa} = %{version}-%{release}
 
 %description devel