logical: Use 'stripes' value for mirror/raid segtype
logical: Use 'stripes' value for mirror/raid segtype

The 'stripes' value is described as the "Number of stripes or mirrors in
a logical volume". So add "mirror" and anything that starts with "raid"
to the list of segtypes that can have an 'nextents' value greater than one.
Use of raid segtypes (raid1, raid4, raid5*, raid6*, and raid10) is favored
over mirror in more recent lvm code.

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

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