lxd/migration/migration/volumes: Updates MatchTypes to return all supported migration types
lxd/migration/migration/volumes: Updates MatchTypes to return all supported migration types

Returns in preference order of local host.

This allows TypesToHeader function to generate rsync features in header, even if first preferred transport type isn't rsync.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

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