Add an internal_create function.
Add an internal_create function.

This consolidates a lot of duplicate code between the
various "deltacloud_create_*" functions.

Signed-off-by: Chris Lalancette <60b62644009db6b194cc0445b64e9b27bb26433a@redhat.com>

ike-dai/libdeltacloud-for-cloudmodule,ike-dai/libdeltacloud-for-cloudmodule