Removes occurences of the personality extension from the V3 API
samples as the extension has been removed. Cleanup of consistency
of image and flavor ref examples for the api samples.
DocImpact
Partially implements blueprint v3-api-remove-extensions
Change-Id: I43a34097904d3d7e280039c3d5d76479a49e92d0
Adds api sample tests and api samples for admin-password
Partially implements blueprint v3-api-unittests
Change-Id: Iade39ff931471d1d68e358ac5d35a1921e85df66
Chris Yeoh