Fix launching of remote image by fingerprint
Fix launching of remote image by fingerprint

We don't need to get the full fingerprint or ensure it's in the db at
this point.  Rather, if a fingerprint is listed in the /1.0/containers
post request, use it.

Closes #411

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

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