Upgrade Fuse Online 7.8 to 7.9

There was a change to use Deployment instead of DeploymentConfig for syndesis-operator in 1.12 branch . That causes that upgrade scenario doesn't work because when `install operator` command is run on 1.12 operator, it creates Deployment but doesn't delete the old syndesis-operator DeploymentConfig from 1.11 version. Due to that, the upgrade stuck because the older syndesis-operator still exists and the new operator is only waiting.

{"level":"info","ts":1612956012.389711,"logger":"leader","msg":"Found existing lock","LockOwner":"syndesis-operator-1-fgsf6"}
{"level":"info","ts":1612949479.2406235,"logger":"leader","msg":"Not the leader. Waiting."}

I see two possible solutions.
1. Before run `install operator` command in upgrade script, the syndesis-operator DC should be deleted `oc delete dc syndesis-operator`. But this cover upgrade only install/upgrade script.
or
2. `install operator` command delete also dc syndesis-operator. In my POV, this solution is better because doesn't cover only the upgrade script.