More changes to support teamed Quantum mode.
Merge pull request #1801 from rhafer/master

more install-chef-suse.sh changes for pebbles
Merge pull request #1800 from VictorLowther/pull-req-master-c9539d81711c2214b06995a82fd0ca64896a1732

Add gre mode support to Quantum. [4/4]
install-chef-suse: Fix $CROWBAR_TESTING installation

- rubygem-cstruct and sleshammer need to be installed on the admin node
- create the /tftpboot compatibility link when CROWBAR_TESTING is enabled