OS-2011 make vmadm more helpful when you pass in invalid JSON.
IMGAPI-111 imgadm v2 blows up with "TypeError: Cannot read property 'size' of undefined" on import

Fix a few problems here: handle error in getting file info preparing
for streaming down an image; improve error message handling in imgapi
client.getImageFileStream; only attempt to import *active* images.
IMGAPI-114 imgadm v2 SourcePing error message doesn't give any details
IMGAPI-113 imgadm v2 allows you to specify the same source twice with and without a '/'

Also, limit response body output for a source ping error (IMGAPI-114).
IMGAPI-114 imgadm v2 SourcePing error message doesn't give any details

update to latest imgadm deps
IMGAPI-112 imgadm v2 considers import of already existing image an error
OS-2014 raise timeout in attempt to get VM tests passing.