Rework SSHbase alias/address support

Rework metadata so that each instance has addresses and aliases instance
attributes containing manually specified addresses and alias names.
Unify pub key resolution loop to process this data once per client.

Change: only clients with active metadata will be included in
ssh_known_hosts data now. Other keys can be stored in *.static, in final
known_hosts file format.

Also, a more exhaustive search for ip addresses is now performed. DNS
resolution for the client hostname, as well as all aliases is performed.
Manually specified addresses are added included as well.

This should also fix some tracebacks reported by Cory and Teknix, as
well as improve performance.

git-svn-id: https://svn.mcs.anl.gov/repos/bcfg/trunk/bcfg2@5319 ce84e21b-d406-0410-9b95-82705330c041

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