For now, these scc are no-ops, are used to check the interfaces
between endorsers and committers for the end-to-end skeleton.
Over time, we will add signature and actual validation of blocks

Handles JIRA issue https://jira.hyperledger.org/browse/FAB-514

(patch 3 redid goimports for importsysccs)

Change-Id: I7a35ed87f83c82f14b1675b955ed5521e7fbda70
Signed-off-by: tuand27613 <tdang@us.ibm.com>