ovirt-provider-ovn installed using engine-setup might

have it's password stored unencrypted in the engine database.

The problem occurs in some pre-4.2.1 engine-setup versions.

To fix the problem in existing ovirt-provider-ovn isntances,

it is enough to open the network provider dialog 

(Administration -> Providers), choose the appropriate network 

provider, open it by clicking "Edit", and confirm changes

by clicking the "OK" button.