switch variables from ansible_hostname to inventory_hostname incase ansible is also configuring the hostname based on the inventory

added file/ibdev2netdev.sh to get Mellanox device name (ie..ens6 or eth1)
template lustre.conf to contain Mellanox device name

included latest mellanox driver name in mellanoxVars.yml

speed up the default slurm provisioing by running groups of users rather than adding each user individually

insert a manual gluster peer probe to attempt to remove what looks like a race condition when executing with strategy free

allow the ssh certs directory to be a symlink without throwing errors. Also update sudo to become inline with ansible2