removed libdnet

it was used only by ganglia-receptor and it was only needed for
solaris (since libdnet is available in the standard centos repo)
receptor: some pieces of receptor are still around, remove them
commands: fix major bug in rocks sync users
cvs: remove the foundation-cvs

version 1.11.23 is available from the standard centos repos
If we need cvs we can just yum install cvs
remove gd

gd is available from the standard centos repo and it is also
a newer version