core: Initialize internal lists in IscsiBond

Initialize the storage domains and the networks when fectching IscsiBond
from query command, also adding a test to the query.

Change-Id: I167b1c6d6c5f83022c18faad555c0ff2e6f1f44b
Bug-Url: https://bugzilla.redhat.com/1133279
Signed-off-by: Maor Lipchuk <mlipchuk@redhat.com>