Add description to the RPM package built by cpack

Author: Andre F de Miranda

CMakeLists.txt

@@ -95,6 +95,7 @@ elseif(UNIX)
     if (RPMBUILD_EXECUTABLE)
         set(CPACK_GENERATOR ${CPACK_GENERATOR} "RPM")
         set(CPACK_RPM_PACKAGE_LICENSE "MPLv2.0")
+        set(CPACK_RPM_PACKAGE_DESCRIPTION "Heka is a tool for collecting and collating data from a number of different sources, performing 'in-flight' processing of collected data, and delivering the results to any number of destinations for further analysis.")
 		# todo we should pull lua_sandbox out of the heka/build and packaging
 		set(CPACK_RPM_PACKAGE_PROVIDES "libluasb.so.0()(64bit), libluasandbox.so.0()(64bit)")
 		set(CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST_ADDITION /usr/share/man)