Move snapshot image property inheritance

The xenapi snapshotting code had support for inheriting properties
from the base image of the snapshot (by way of the system metadata
set on the snapshotted instance).  The problem, however, came in the
fact that some image properties were set in nova.compute.api, but
those properties were not excluded from this inheritance logic
except through a configuration option called
"non_inheritable_image_properties".  I had previously updated the
default setting for this option to work around the bugs introduced
by setting image properties in two different locations, but now it
is time for the real fix.

This change moves the inheritance logic into
nova.compute.api:API._create_image.  Note that two properties are
still set through the xenapi snapshotting logic: the "os_type" and
the "auto_disk_config" properties, which are presumed to be xenapi
specific.  The change also alters the inheritance logic to ensure
that the work-around listing of image properties in
non_inheritable_image_properties is no longer necessary; the
default for this configuration option is updated accordingly.

(Note: It will not harm anything to have these image properties
still listed in non_inheritable_image_properties, so configurations
that override this option do not need to be altered.)

Change-Id: I3514da432cc10c75418e1de9752f60640d579136

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