Change image create method from pull from remote to local

For nodes without internet access, image create from remote location
does not work, so have to create image file from source location first
by chef-client with http_proxy and then upload the image to glance from
the downloaded file.

Change-Id: Ic0c0474dac1aae815e5ab8f6914a3f7aa3411908
Merge "Change image create method from pull from remote to local"