DOC: 3 bad URLs references

[JiffB]

Hi folks-that-dwells-among-multiple-replicated-servers,
 
The doc refers to two bad URLs on this page :
https://glusterdocs.readthedocs.io/en/latest/Administrator%20Guide/RDMA%20Transport/
Section : Setup
The first one isn't anymore in any DNS server : site not found :
http://pkg-ofed.alioth.debian.org/howto/infiniband-howto.html
The second one drives you to the site but not its page :
http://people.redhat.com/dledford/infiniband_get_started.html
NB : This page apparently do not exist anymore.
 
There is also a link that points to either a 404 or a private page in this page :
https://glusterdocs.readthedocs.io/en/latest/Administrator%20Guide/Gluster%20On%20ZFS/
Section : Recurring ZFS Snapshots
Link name : Recurring ZFS Snapshots
Pointing to : http://community.spiceworks.com/how_to/show/15303-recurring-zfs-snapshots
Leads to a page that says : Oops! That page doesn’t exist or is private.
 
Jean-Yves