remove sockpuppet from puppet

remove sockpuppet from:

-backup files
-dsh groups
-site.pp
-install-server/dhcp
-puppet-merge script
-post-merge template

also follow-up to RT #6175
and to get out of Tampa

sockpuppet is not puppetmaster anymore,
and neither is it saltmaster.

see how it is commented already in role/salt.pp
so it doesn't select a site anymore but is always
palladium

< Ryan_Lane> sockpuppet isn't master for anything anymore, then
< bblack> palladium does salt

but if we want to keep this as some kind of fall-over until the
end then just don't merge it yet but use it later?

Change-Id: I773c188f865880e50fb4b643fb47ae50e4cec03d