[BucketDriver] Add Pure FB String function (#2085)
[BucketDriver] Add Pure FB String function (#2085)

Signed-off-by: Grant Griffiths <9e861e735dbffdbb5b2e8045785fd9c6c1c571e7@purestorage.com>
libopenstorage/openstorage,libopenstorage/openstorage,libopenstorage/openstorage