Description of problem: addNetwork does not wait for a slow dhcp response. Therefore, network is not available when addNetwork returns. This is known and expected, but unwanted on init scripts. We thus add a new param, blockingdhcp=true, signifying that addNetwork should block until ip address is returned from dhcp server (or until timeout). vdsm-reg and vds-bootstrap will use this flag (while VDC should not)
sp183-4.4-34149