Reset of election version is 1 and not 0 apparently
Remove use of non-versioned voting

Conflicts:
	enterprise/cluster/src/main/java/org/neo4j/cluster/protocol/atomicbroadcast/multipaxos/context/ClusterContextImpl.java
Removed backward compatibility test
Make sure we always send VersionedVoteData by asking with proper VoteRequests

Conflicts:
	enterprise/cluster/src/main/java/org/neo4j/cluster/protocol/election/ElectionState.java
Merge pull request #2813 from digitalstain/1.9-versioned-election

Backport of the removal of versioned election compatibility