Downgrade Oozie

Downgrade each Oozie server one at a time.

Shut down the Oozie server, switch to the previous version, and start the server:
su - oozie -c "/usr/hdp/current/oozie-server/bin/oozied.sh stop"
hdp-select set oozie-server 2.2.0.0-2041
su - oozie -c "/usr/hdp/current/oozie-server/bin/oozie-start.sh"
To validate the downgrade process, check Oozie service status:
oozie admin -oozie http://<OOZIE_SERVER_HOST>:11000/oozie -status
For example:
```
# oozie admin -oozie http://node-1:11000/oozie -status
System mode: NORMAL
```
In addition, run Oozie smoke tests (see Appendix A).

Continue with the next downgrade step.