Add 2.6 repository for node

Conflicts:
	provision/node.sh
	provision/node_sles11.sh
Fix debian server.sh
Refs #3525 - Fix SLES 11 VM for vagrant
Fix repository URL for zypper
Remove DVD repository which is broken for SLES 11
Add Ubuntu support
iMerge branch 2.4 in 2.5
Merge branch 'branches/rudder/2.5' into branches/rudder/2.6

Conflicts:
	provision/node.sh
	provision/node_sles11.sh
	provision/server.sh
	provision/server_sles11.sh
	provision/server_ubuntu.sh