Update RPM-GPG-KEY-gluster.pub
Update RPM-GPG-KEY-gluster.pub

The Gluster repo GPG Key [has changed](https://download.gluster.org/pub/gluster/glusterfs/LATEST/NEW_PUBLIC_KEY.README)
covermymeds/puppet-gluster,puppet-community/puppet-gluster,zstyblik/puppet-gluster,voxpupuli/puppet-gluster