Add an API extension for creating+deleting flavors

This extension is a step towards deprecating openstackx for horizon.
Most of the extension code is based on the equivalent in openstackx.

v2:
    s/lifecycle/manage/ for all bits
    Address Pádraig style issues
    Drop purge API option
    Adjust now inaccurate comment in DB api
    Make extension admin_only
    Extend existing /flavors namespace rather than os-flavor-lifecycle
    Only allow API access from admin user

v3:
    Some pep8 fixes

v4:
    Adjust to root_gb, ephemeral_gb changes
    Drop admin_only (it's on the way out AIUI)

Change-Id: I3fdfccdd8e7337e1759f5875c3b15fa9954371ef

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