agent: extend timeout for domain monitor acquisition
agent: extend timeout for domain monitor acquisition

Acquisition may take ~3 minutes, so extend timeout to 4.

Change-Id: Ic586b1f11374632724cf71da5d3cac72eb83ca19
Bug-Url: https://bugzilla.redhat.com/1018849
Signed-off-by: Greg Padgett <3af508f6206cdc15d61fd615066fc83e4b020700@redhat.com>

oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha