Upgrading DSE OpsCenter when failover is enabled

Process to follow when upgrading OpsCenter and failover is enabled.

Follow this process when upgrading OpsCenter and failover is enabled.

Stop the secondary (backup) OpsCenter instance.
Upgrade the primary OpsCenter instance:
1. Stop OpsCenter.
2. Upgrade OpsCenter using the package or tarball instructions as appropriate.
3. Start OpsCenter.
Upgrade the secondary OpsCenter instance.
Start the secondary OpsCenter instance.

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