Cannot flip voting status to Secondary when all Voting nodes in Primary are down

1. Setup a geo-cluster with 1,2,3 as voting and 4,5,6 as non-voting
– make sure first node in the list is node 1 (seed-node) 
2. Bring down all nodes in Primary
3. Flip voting node to Secondary

1a. Geo Cluster should be formed with node from primary as leader and 5 followers
2a. Node 4, 5, & 6 should be reachable
3a. Secondary should start election, with leader elected and cluster should be formed

Fails at Step 3 and does not change the voting status.This works good in 4.3.0.