Check for attached disk by disk_cid instead of full path

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>
Log when health monitor is returning 500 from healthz

Signed-off-by: Zachary Auerbach <zauerbach@pivotal.io>
Be more selective when searching for virtual disks

[#82580826]
updated CHANGELOG with build 2786, 2785, 2781, 2780, 2778, 2765
Merge final release for build 2787 to develop
Adding final release for build 2788