Check the flashcopy mapping relationship before deleting volume. Currently the volume stays in 'deleting' if there is fcmapping for IBM storwize/SVC driver. Change it to stop the fcmapping first if the volume is the target volume of the fcmapping. DocImpact Change-Id: I99fdbbeda4151d4e02ebd6a0ede9a49eb2abc618 Closes-Bug: 1534118
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