Get rid of GMS.shun=false in JGroups protocol stacks

There are several protocol stack configs that have FD.shun=true and GMS.shun=false. This makes no sense and from side discussions appears to have been a typo. Change the GMS to true.

[10:23:01] Brian Stansberry: do you know any reason to have FD.shun=true and GMS.shun=false....
[10:23:04] ... 1) in general
[10:23:10] ... 2) in a TUNNEL config?
[10:23:43] Bela Ban: No