write xmlrpc function getCompDesc that is to be contributed to the upstream. Please refer to the following url for details on Bugzilla::RPC 2.18 functions mapped to upstream Bugzilla::WebService and for 2.18 xmlrpc functions sorted by percentage of calls: https://engineering.redhat.com/trac/bugzilla-3.0-rh/wiki/XmlrpcCrossComparison#a2.18xmlrpcfunctionssortedbypercentageofcalls
This function will not be ported to temporary xmlrpc interface, its functionality can be accomplished with new API Bugzilla::WebService::Component