jsonrpc: Host_delNetwork

Newly modified API verb needs aligment with schema.


Change-Id: I11e8b6f5e706f7a1ed07ace8830153540c4b9e6d
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/36096
Reviewed-by: Adam Litke <alitke@redhat.com>