[serviced_svcdef_compiler] Add a target for exporting serviced to a well-known location                            (e.g., $GOPATH/bin/serviced) for reference / use by the svcdef                            build rule defined elsewhere.
[serviced_svcdef_compiler] Add a target for exporting serviced to a well-known location
                           (e.g., $GOPATH/bin/serviced) for reference / use by the svcdef
                           build rule defined elsewhere.

Add some convenience macros for various gopaths.

control-center/serviced,control-center/serviced,control-center/serviced,control-center/serviced,control-center/serviced,control-center/serviced,control-center/serviced,control-center/serviced