jsonrpc: StoragePool_connect

Align naming between API.py and schema.

Change-Id: Icbf7f4475f52a603a8d64640069bc7a3d8623b62
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/35542
Reviewed-by: Adam Litke <alitke@redhat.com>