build: update rpm spec to reflect graphite license
build: update rpm spec to reflect graphite license

Bizzare and questionable as this is, the Graphite
webapp embeds GPLv3 code into an ASL2 code base -
update the licensing note to reflect this.

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp