core: trailing spaces removed from dstSdUUID

Image.move fails due to trailing spaces in dstSdUUID. Removing them
fixes marshalling issue.

Bug-Url: https://bugzilla.redhat.com/1126531
Change-Id: I7d6b2b51a4f65fa23c1723e262a58deabaeaea83
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>