fix argument between the group add and group modify opinions of who should be in the group
fix argument between the group add and group modify opinions of who should be in the group

michaelklishin/cassandra-chef-cookbook,criteo-forks/cassandra-chef-cookbook,criteo-forks/cassandra-chef-cookbook,vkhatri/cassandra-chef-cookbook,adityagodbole/cassandra-chef-cookbook,msilvey/cassandra-chef-cookbook,alrf/cassandra-cookbook,msilvey/cassandra-chef-cookbook,alrf/cassandra-cookbook,TD-4242/cassandra-chef-cookbook,vkhatri/cassandra-chef-cookbook,TD-4242/cassandra-chef-cookbook,alrf/cassandra-cookbook,jfwm2/cassandra-chef-cookbook,vdemonchy/cassandra-chef-cookbook,adityagodbole/cassandra-chef-cookbook,vkhatri/cassandra-chef-cookbook,jfwm2/cassandra-chef-cookbook,TD-4242/cassandra-chef-cookbook,adityagodbole/cassandra-chef-cookbook,michaelklishin/cassandra-chef-cookbook,vdemonchy/cassandra-chef-cookbook,vdemonchy/cassandra-chef-cookbook,michaelklishin/cassandra-chef-cookbook,criteo-forks/cassandra-chef-cookbook,jfwm2/cassandra-chef-cookbook,msilvey/cassandra-chef-cookbook