Goal

As a user, I want to be warned when my actions can lead to a cluster with no fencing. Some cases were covered by RHEL-66607. This Jira is about covering the case when stonith-enabled cluster property is being set to false.

Acceptance criteria

• When setting stonith-enabled cluster property to false, pcs CLI does not proceed and ends up with an error
• The error can be overriden, in which case pcs sets the property
• When setting stonith-enabled cluster property to false, pcs web UI does not proceed and ends up with an error
• The error can be overriden, in which case pcs sets the property

Note - fencing-enabled

• Pacemaker recently renamed stonith-enabled cluster property to fencing-enabled, while keeping stonith-enabled functional (even though deprecated). Behavior described in acceptance criteria should cover both the new property and the legacy one.

This ticket also includes removing warning of `pcs status`:
`No stonith devices and stonith-enabled is not false`