Revert "BIGTOP-2839. Bump Hadoop version to 2.7.4"
Revert "BIGTOP-2839. Bump Hadoop version to 2.7.4"

This reverts commit 2890d95329d4b517bdfd4c547831c3622292c7d6.

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