jsonrpc: Host_getStorageDomains

Align naming between API.py and schema.


Change-Id: I518bcee701be96b8b0c9ec5d032f15ceeeedc14b
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/35523
Reviewed-by: Adam Litke <alitke@redhat.com>