[HDDS-1996] Recon server v2 (implemented)
Authors: Aravindan Vijayan, Vivek Ratnavel Subramanian, Sid Wagle
Second phase of Recon development. Recon acts as a passive SCM.
The second phase of Recon development. The biggest change is that Recon can act as a passive SCM, collect HB from Datanode and analyze the data.