BIGTOP-2310: introduce NEXUS_URL for configuring nexus server
BIGTOP-2310: introduce NEXUS_URL for configuring nexus server

sekikn/bigtop,mbalassi/bigtop,evans-ye/bigtop,juju-solutions/bigtop,apache/bigtop,arenadata/bigtop,welikecloud/bigtop,youngwookim/bigtop,Guavus/bigtop,JunHe77/bigtop,welikecloud/bigtop,apache/bigtop,youngwookim/bigtop,panagiotisl/bigtop,Altiscale/bigtop,apache/bigtop,youngwookim/bigtop,apache/bigtop,mbalassi/bigtop,juju-solutions/bigtop,alaunay/bigtop,alaunay/bigtop,panagiotisl/bigtop,alaunay/bigtop,youngwookim/bigtop,sekikn/bigtop,alaunay/bigtop,arenadata/bigtop,JunHe77/bigtop,arenadata/bigtop,JunHe77/bigtop,juju-solutions/bigtop,Guavus/bigtop,mbalassi/bigtop,panagiotisl/bigtop,juju-solutions/bigtop,Guavus/bigtop,Altiscale/bigtop,Guavus/bigtop,welikecloud/bigtop,Altiscale/bigtop,arenadata/bigtop,sekikn/bigtop,evans-ye/bigtop,evans-ye/bigtop,evans-ye/bigtop,Altiscale/bigtop,welikecloud/bigtop,JunHe77/bigtop,panagiotisl/bigtop,apache/bigtop,sekikn/bigtop,mbalassi/bigtop,sekikn/bigtop