Add term and OpId to VoteRequest / response PBs
Add term and OpId to VoteRequest / response PBs

Replace watermarks with last OpId stored in the local WAL per RAFT
section 5.4.1.

Change-Id: If5c3d311ccad68d030f95a46009c2d0ae33791f8
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4743
Reviewed-by: David Alves <33ea948168c114d220e0372a903be6ee60f6396e@cloudera.com>
Tested-by: jenkins

andrwng/kudu,EvilMcJerkface/kudu,helifu/kudu,InspurUSA/kudu,cloudera/kudu,cloudera/kudu,helifu/kudu,cloudera/kudu,andrwng/kudu,InspurUSA/kudu,InspurUSA/kudu,cloudera/kudu,andrwng/kudu,cloudera/kudu,EvilMcJerkface/kudu,helifu/kudu,andrwng/kudu,helifu/kudu,InspurUSA/kudu,cloudera/kudu,andrwng/kudu,andrwng/kudu,InspurUSA/kudu,andrwng/kudu,helifu/kudu,InspurUSA/kudu,helifu/kudu,InspurUSA/kudu,cloudera/kudu,cloudera/kudu,InspurUSA/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,InspurUSA/kudu,EvilMcJerkface/kudu,andrwng/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,helifu/kudu,EvilMcJerkface/kudu,helifu/kudu,cloudera/kudu,helifu/kudu,EvilMcJerkface/kudu,andrwng/kudu