bad indentation in glance code

pylint finds several cases of:

************* Module glance.registry.api.v1.__init__
W: 22, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 24, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 27, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 31, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 35, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 39, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 43, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 47, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 52, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 54, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 58, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 62, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 66, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 70, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 74, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 78, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
************* Module glance.registry.api.v2.__init__
W: 21, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
W: 22, 0: Bad indentation. Found 8 spaces, expected 4 (bad-indentation)
************* Module glance.domain.__init__
W:354, 0: Bad indentation. Found 12 spaces, expected 8 (bad-indentation)
W:361, 0: Bad indentation. Found 12 spaces, expected 8 (bad-indentation)
W:362, 0: Bad indentation. Found 16 spaces, expected 12 (bad-indentation)
W:363, 0: Bad indentation. Found 12 spaces, expected 8 (bad-indentation)
W:364, 0: Bad indentation. Found 16 spaces, expected 12 (bad-indentation)