Add ability to detect unofficial openjdk builds.
Add ability to detect unofficial openjdk builds.

Patch by brandonwilliams, reviewed by enigmacurry for CASSANDRA-7799

yonglehou/cassandra,shawnkumar/cstargraph,rdio/cassandra,krummas/cassandra,RyanMagnusson/cassandra,AtwooTM/cassandra,joesiewert/cassandra,knifewine/cassandra,knifewine/cassandra,jasobrown/cassandra,fengshao0907/Cassandra-Research,bpupadhyaya/cassandra,AtwooTM/cassandra,modempachev4/kassandra,beobal/cassandra,apache/cassandra,a-buck/cassandra,mkjellman/cassandra,bcoverston/cassandra,sayanh/ViewMaintenanceCassandra,DICL/cassandra,pcn/cassandra-1,nvoron23/cassandra,thelastpickle/cassandra,gdusbabek/cassandra,sayanh/ViewMaintenanceSupport,tjake/cassandra,likaiwalkman/cassandra,juiceblender/cassandra,nutbunnies/cassandra,tongjixianing/projects,yukim/cassandra,nvoron23/cassandra,hengxin/cassandra,ejankan/cassandra,jrwest/cassandra,exoscale/cassandra,cooldoger/cassandra,yanbit/cassandra,newrelic-forks/cassandra,thelastpickle/cassandra,strapdata/cassandra,rmarchei/cassandra,WorksApplications/cassandra,Instagram/cassandra,dkua/cassandra,krummas/cassandra,jeromatron/cassandra,pauloricardomg/cassandra,scylladb/scylla-tools-java,xiongzheng/Cassandra-Research,boneill42/cassandra,aweisberg/cassandra,yangzhe1991/cassandra,mt0803/cassandra,snazy/cassandra,Instagram/cassandra,whitepages/cassandra,tommystendahl/cassandra,aboudreault/cassandra,ifesdjeen/cassandra,Bj0rnen/cassandra,LatencyUtils/cassandra-stress2,qinjin/mdtc-cassandra,christian-esken/cassandra,pkdevbox/cassandra,Jollyplum/cassandra,ptnapoleon/cassandra,jkni/cassandra,jbellis/cassandra,bdeggleston/cassandra,macintoshio/cassandra,likaiwalkman/cassandra,iamaleksey/cassandra,apache/cassandra,Jaumo/cassandra,aureagle/cassandra,bpupadhyaya/cassandra,snazy/cassandra,AtwooTM/cassandra,lalithsuresh/cassandra-c3,hhorii/cassandra,mkjellman/cassandra,DikangGu/cassandra,fengshao0907/Cassandra-Research,tongjixianing/projects,exoscale/cassandra,darach/cassandra,emolsson/cassandra,LatencyUtils/cassandra-stress2,iburmistrov/Cassandra,mshuler/cassandra,dkua/cassandra,stef1927/cassandra,michaelmior/cassandra,iamaleksey/cassandra,weipinghe/cassandra,mt0803/cassandra,rogerchina/cassandra,hhorii/cassandra,whitepages/cassandra,EnigmaCurry/cassandra,adelapena/cassandra,strapdata/cassandra,newrelic-forks/cassandra,Stratio/stratio-cassandra,mambocab/cassandra,jkni/cassandra,thobbs/cassandra,kangkot/stratio-cassandra,hengxin/cassandra,jasobrown/cassandra,codefollower/Cassandra-Research,WorksApplications/cassandra,instaclustr/cassandra,rmarchei/cassandra,rogerchina/cassandra,DICL/cassandra,apache/cassandra,rackerlabs/cloudmetrics-cassandra,guard163/cassandra,blerer/cassandra,lalithsuresh/cassandra-c3,spodkowinski/cassandra,gdusbabek/cassandra,iburmistrov/Cassandra,ejankan/cassandra,michaelsembwever/cassandra,jasonstack/cassandra,asias/cassandra,guard163/cassandra,scylladb/scylla-tools-java,jeromatron/cassandra,jasobrown/cassandra,scaledata/cassandra,kgreav/cassandra,pcn/cassandra-1,driftx/cassandra,RyanMagnusson/cassandra,Instagram/cassandra,regispl/cassandra,mkjellman/cassandra,Imran-C/cassandra,Instagram/cassandra,pthomaid/cassandra,modempachev4/kassandra,jsanda/cassandra,tjake/cassandra,pauloricardomg/cassandra,aarushi12002/cassandra,szhou1234/cassandra,pauloricardomg/cassandra,mshuler/cassandra,weipinghe/cassandra,codefollower/Cassandra-Research,mheffner/cassandra-1,bmel/cassandra,josh-mckenzie/cassandra,Stratio/stratio-cassandra,driftx/cassandra,shawnkumar/cstargraph,iburmistrov/Cassandra,spodkowinski/cassandra,sluk3r/cassandra,blambov/cassandra,scylladb/scylla-tools-java,DikangGu/cassandra,kgreav/cassandra,Jaumo/cassandra,aweisberg/cassandra,mike-tr-adamson/cassandra,aweisberg/cassandra,jasonwee/cassandra,bcoverston/cassandra,weideng1/cassandra,tommystendahl/cassandra,thelastpickle/cassandra,fengshao0907/cassandra-1,beobal/cassandra,pcmanus/cassandra,ben-manes/cassandra,GabrielNicolasAvellaneda/cassandra,regispl/cassandra,vaibhi9/cassandra,asias/cassandra,guanxi55nba/db-improvement,Bj0rnen/cassandra,jasonwee/cassandra,chbatey/cassandra-1,ben-manes/cassandra,bdeggleston/cassandra,nitsanw/cassandra,boneill42/cassandra,swps/cassandra,GabrielNicolasAvellaneda/cassandra,macintoshio/cassandra,sedulam/CASSANDRA-12201,nvoron23/cassandra,yonglehou/cassandra,adejanovski/cassandra,krummas/cassandra,Stratio/stratio-cassandra,thelastpickle/cassandra,macintoshio/cassandra,blerer/cassandra,sedulam/CASSANDRA-12201,RyanMagnusson/cassandra,driftx/cassandra,weideng1/cassandra,caidongyun/cassandra,vramaswamy456/cassandra,ptuckey/cassandra,pofallon/cassandra,chbatey/cassandra-1,fengshao0907/Cassandra-Research,Imran-C/cassandra,nitsanw/cassandra,guanxi55nba/db-improvement,snazy/cassandra,Jollyplum/cassandra,scaledata/cassandra,mashuai/Cassandra-Research,bdeggleston/cassandra,darach/cassandra,mike-tr-adamson/cassandra,weideng1/cassandra,beobal/cassandra,scylladb/scylla-tools-java,Stratio/stratio-cassandra,qinjin/mdtc-cassandra,pauloricardomg/cassandra,tjake/cassandra,mkjellman/cassandra,scaledata/cassandra,belliottsmith/cassandra,iamaleksey/cassandra,sharvanath/cassandra,mike-tr-adamson/cassandra,pthomaid/cassandra,thobbs/cassandra,blerer/cassandra,guanxi55nba/key-value-store,LatencyUtils/cassandra-stress2,chbatey/cassandra-1,michaelsembwever/cassandra,cooldoger/cassandra,ptnapoleon/cassandra,yanbit/cassandra,dkua/cassandra,caidongyun/cassandra,exoscale/cassandra,michaelsembwever/cassandra,krummas/cassandra,ptnapoleon/cassandra,michaelmior/cassandra,ollie314/cassandra,bdeggleston/cassandra,jeffjirsa/cassandra,Stratio/stratio-cassandra,mike-tr-adamson/cassandra,tommystendahl/cassandra,pallavi510/cassandra,ejankan/cassandra,JeremiahDJordan/cassandra,apache/cassandra,yukim/cassandra,ptuckey/cassandra,sayanh/ViewMaintenanceCassandra,dongjiaqiang/cassandra,belliottsmith/cassandra,caidongyun/cassandra,carlyeks/cassandra,christian-esken/cassandra,yangzhe1991/cassandra,aureagle/cassandra,phact/cassandra,christian-esken/cassandra,spodkowinski/cassandra,adelapena/cassandra,chaordic/cassandra,chaordic/cassandra,iamaleksey/cassandra,yhnishi/cassandra,pcmanus/cassandra,jsanda/cassandra,jbellis/cassandra,bcoverston/cassandra,jasonstack/cassandra,swps/cassandra,sharvanath/cassandra,jeffjirsa/cassandra,joesiewert/cassandra,helena/cassandra,mheffner/cassandra-1,carlyeks/cassandra,aweisberg/cassandra,rackerlabs/cloudmetrics-cassandra,WorksApplications/cassandra,rdio/cassandra,jeffjirsa/cassandra,pcn/cassandra-1,GabrielNicolasAvellaneda/cassandra,xiongzheng/Cassandra-Research,josh-mckenzie/cassandra,yukim/cassandra,lalithsuresh/cassandra-c3,pallavi510/cassandra,ifesdjeen/cassandra,tjake/cassandra,sharvanath/cassandra,a-buck/cassandra,pkdevbox/cassandra,szhou1234/cassandra,swps/cassandra,MasahikoSawada/cassandra,belliottsmith/cassandra,modempachev4/kassandra,ptuckey/cassandra,guanxi55nba/db-improvement,MasahikoSawada/cassandra,jkni/cassandra,vaibhi9/cassandra,yhnishi/cassandra,DICL/cassandra,emolsson/cassandra,nutbunnies/cassandra,tommystendahl/cassandra,sedulam/CASSANDRA-12201,helena/cassandra,rogerchina/cassandra,gdusbabek/cassandra,mashuai/Cassandra-Research,sluk3r/cassandra,phact/cassandra,jrwest/cassandra,guanxi55nba/key-value-store,likaiwalkman/cassandra,mheffner/cassandra-1,ollie314/cassandra,snazy/cassandra,adejanovski/cassandra,sivikt/cassandra,instaclustr/cassandra,rmarchei/cassandra,tongjixianing/projects,yhnishi/cassandra,mashuai/Cassandra-Research,sivikt/cassandra,DikangGu/cassandra,mambocab/cassandra,stef1927/cassandra,ben-manes/cassandra,beobal/cassandra,emolsson/cassandra,driftx/cassandra,rdio/cassandra,strapdata/cassandra,spodkowinski/cassandra,jeromatron/cassandra,aureagle/cassandra,adelapena/cassandra,nutbunnies/cassandra,michaelmior/cassandra,yanbit/cassandra,cooldoger/cassandra,mshuler/cassandra,kgreav/cassandra,wreda/cassandra,kangkot/stratio-cassandra,adelapena/cassandra,EnigmaCurry/cassandra,bpupadhyaya/cassandra,yonglehou/cassandra,Jollyplum/cassandra,juiceblender/cassandra,kgreav/cassandra,JeremiahDJordan/cassandra,jrwest/cassandra,shawnkumar/cstargraph,sluk3r/cassandra,chaordic/cassandra,juiceblender/cassandra,sayanh/ViewMaintenanceCassandra,xiongzheng/Cassandra-Research,pthomaid/cassandra,jasonstack/cassandra,carlyeks/cassandra,weipinghe/cassandra,sayanh/ViewMaintenanceSupport,clohfink/cassandra,newrelic-forks/cassandra,whitepages/cassandra,a-buck/cassandra,instaclustr/cassandra,kangkot/stratio-cassandra,asias/cassandra,EnigmaCurry/cassandra,blerer/cassandra,blambov/cassandra,dongjiaqiang/cassandra,ifesdjeen/cassandra,knifewine/cassandra,jbellis/cassandra,ollie314/cassandra,jasonwee/cassandra,rackerlabs/cloudmetrics-cassandra,jasobrown/cassandra,mambocab/cassandra,jeffjirsa/cassandra,juiceblender/cassandra,Bj0rnen/cassandra,kangkot/stratio-cassandra,MasahikoSawada/cassandra,vramaswamy456/cassandra,josh-mckenzie/cassandra,dongjiaqiang/cassandra,kangkot/stratio-cassandra,stef1927/cassandra,clohfink/cassandra,Jaumo/cassandra,aarushi12002/cassandra,sivikt/cassandra,bmel/cassandra,strapdata/cassandra,stef1927/cassandra,pofallon/cassandra,Imran-C/cassandra,blambov/cassandra,ifesdjeen/cassandra,szhou1234/cassandra,fengshao0907/cassandra-1,michaelsembwever/cassandra,aarushi12002/cassandra,vramaswamy456/cassandra,pcmanus/cassandra,pallavi510/cassandra,josh-mckenzie/cassandra,wreda/cassandra,guard163/cassandra,jrwest/cassandra,joesiewert/cassandra,instaclustr/cassandra,hengxin/cassandra,guanxi55nba/key-value-store,qinjin/mdtc-cassandra,mshuler/cassandra,mt0803/cassandra,bcoverston/cassandra,vaibhi9/cassandra,helena/cassandra,clohfink/cassandra,thobbs/cassandra,nitsanw/cassandra,adejanovski/cassandra,cooldoger/cassandra,hhorii/cassandra,jsanda/cassandra,clohfink/cassandra,pkdevbox/cassandra,regispl/cassandra,fengshao0907/cassandra-1,darach/cassandra,wreda/cassandra,blambov/cassandra,pofallon/cassandra,aboudreault/cassandra,aboudreault/cassandra,WorksApplications/cassandra,szhou1234/cassandra,codefollower/Cassandra-Research,belliottsmith/cassandra,boneill42/cassandra,yangzhe1991/cassandra,bmel/cassandra,yukim/cassandra,JeremiahDJordan/cassandra,phact/cassandra