Add upgrade/downgrade coverage for EMRC=false

Before disabling emrc=false, we should add the following test cases to have coverage of upgrade/downgrade.

1. User runs 4.4 with eMRC=false, shuts down the node, and restarts it with a 5.0 binary and eMRC=true
2. User runs 5.0 with eMRC=true, shuts down the node, and restarts it with a 4.4 binary and eMRC=false

Both of these should occur in FCV 4.4.