Extract DeploymentLookup and InstanceLookup from InstanceManager

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
DeploymentManager delegates find_by_name to DeploymentLookup

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>
Added endpoint for pausing resurrection on all instances

[#55863304]

Signed-off-by: Jeffrey Peckham <peckham@pivotallabs.com>