dhcp-scope-usage add switch for displaying only scopes in error.

[drapiti]

Describe the solution you'd like

Much like the disk-usage check please introduce a switch to the dhcp-scope plugin which allows to filter output for scopes only in an error state. Some servers have thousands of scopes it is not practical to include all of them in the output as is the case at moment.

Additional context

No response

[markuslf]

Sounds good.