Fix Bug 2282: Can't instantiate NS using a pre-existing volume
Add the posibility to return an empty dictionary to `find_persistent_root_volumes()` method so the NS instantiation doesn't fail while using a pre existing volume. Change-Id: Iecd7041b2a202332acecd45a3e899d82be613ef7 Signed-off-by: Luis Vega <lvega@whitestack.com> Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
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