dd55030 Add default transport to push if not provided

Authored and Committed by dwalsh 6 years ago
      Add default transport to push if not provided
      Avoid trying to print a nil ImageReference
      Add authentication to commit and push
      Add information on buildah from man page on transports
      Remove --transport flag
      Run: do not complain about missing volume locations
      Add credentials to buildah from
      Remove export command
      Run(): create the right working directory
      Improve "from" behavior with unnamed references
      Avoid parsing image metadata for dates and layers
      Read the image's creation date from public API
      Bump containers/storage and containers/image
      Don't panic if an image's ID can't be parsed
      Turn on --enable-gc when running gometalinter
      rmi: handle truncated image IDs
    
        
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