OS-2981: 'imgadm avail' breaks on a DSAPI source
OS-2989: 'imgadm import ...' from a DSAPI source fails

Also workaround mcavage/node-restify#501 issue with
bunyan client_req/res serializers in trace-level logging.

Change to preferring "$name@$version" form when printing an
image name and version.
make check clean
OS-2990 lx brand ubuntu 12 installer
wip
Merge branch 'master' into OS-2814