Whitespace: xapi_sr.ml

$ camlp4o -printer o -no_comments ocaml/xapi/xapi_srl | md5sum
7760aa8c3f302bc5ebca565b2c83b483  -
$ git checkout HEAD^
$ camlp4o -printer o -no_comments ocaml/xapi/xapi_sr.ml | md5sum
7760aa8c3f302bc5ebca565b2c83b483  -

Signed-off-by: John Else <john.else@citrix.com>
CA-98633: Raise SR_UUID_EXISTS in SR.introduce if an SR with the same UUID already exists.

Signed-off-by: John Else <john.else@citrix.com>
Merge pull request #1004 from johnelse/ca-98633

CA-98633: Raise SR_UUID_EXISTS in SR.introduce if an SR with the same UUID already exists.