Fixing name of group for bigtable-hbase-dataflow.
Fixing name of group for bigtable-hbase-dataflow.

waprin/cloud-bigtable-client,kevinsi4508/cloud-bigtable-client,rameshdharan/cloud-bigtable-client,sduskis/cloud-bigtable-client,kevinsi4508/cloud-bigtable-client,googleapis/java-bigtable-hbase,sduskis/cloud-bigtable-client,googleapis/java-bigtable-hbase,derjust/cloud-bigtable-client,rameshdharan/cloud-bigtable-client,agibsonccc/cloud-bigtable-client,googleapis/java-bigtable-hbase