Improvement on waitForCompletion API

After TEZ-1476, the waitForCompletion API has serveral changes may need to reconsider.

1. waitForCompletionWithStatusUpdates(Set<Vertex> vertices, Set<StatusGetOpts> statusGetOpts) is replace with waitForCompletionWithStatusUpdates(Set<StatusGetOpts> statusGetOpts), this lead to backward compatibility issue. User can not specify what vertices to print now.
2. should add indention in front of VertexStatus when printing VertexStatus.