Prevent trailing spaces in json output of iam get (#977)
Prevent trailing spaces in json output of iam get (#977)

`json.dumps` will output trailing spaces after commas, if an indent is
specified. Explicity defining the separators, i.e., comma without a
space, fixes this.

Closes: https://github.com/GoogleCloudPlatform/gsutil/issues/975

Signed-off-by: Bart Smykla <05a61b7a17440ad59b313e4d55e2ded5a86010f0@vmware.com>
GoogleCloudPlatform/gsutil,GoogleCloudPlatform/gsutil