Add a popover for pod status that shows additional details for unschedulable and failing pods.

• If pod is Unschedulable, add a popover to Pending status that includes the reason the pod is unschedulable on the pod list and pod details pages.
• If pod status is CrashLoopBackoff, add a popover to the CrashLoopBackoff status that includes the reason for the error on the pod list and pod details pages.
• If pod status is ErrImagePull, add a popover to the ErrImagePull status that includes the reason for the error on the pod list and pod details pages.
• If pod status is ImagePullBackOff, add a popover to the ImagePullBackOff status that includes the reason for the error on the pod list and pod details pages.