BIGTOP-2693. Update readme for build and configuring git repo for packages
BIGTOP-2693. Update readme for build and configuring git repo for packages

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