packaging: fix error when enabling KeyCloak

This fixes engine-setup error:
[ ERROR ] Failed to execute stage 'Misc configuration': 'OVESETUP_OVN/ovirtProviderOvnSecret'

Since commit 978c90e we save the ovirtProviderOvnSecret value in the
setup file.
But if this value is not there, but ovirtProviderOvn is True, the
engine-setup fails.

So if we can't find the value in the config, a new password is
generated.

Signed-off-by: Jean-Louis Dupond <jean-louis@dupond.be>

packaging/setup/plugins/ovirt-engine-setup/ovirt-engine/network/ovirtproviderovn.py

@@ -1111,6 +1111,8 @@ def _misc_configure_provider(self):
                 oengcommcons.KeycloakEnv.ENABLE
             )
             if keycloak_enabled:
+                if self.environment.get(OvnEnv.OVIRT_PROVIDER_OVN_SECRET) is None:
+                    self._generate_client_secret()
                 self._configure_ovirt_provider_ovn()
 
     @plugin.event(