-Move all waiting to a common loop, waiting a total of no more than 80 seconds for all nics
-Give up after 15 seconds with no link-up reported by ethtool
-Detect suspect spanning-tree.
-Record spanning-tree suspicion, no link, and total dhcp timeouts to /etc/motd
-Have /etc/profile in nbroot cat /etc/motd, to make ssh into shell report diagnostic messages
git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@843 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd
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