---
features:
  - |
    New API validators ``validate_oneline_not_empty_string`` and
    ``validate_oneline_not_empty_string_or_none`` are added. Those validators
    are now used to validate ``opt_name`` and ``opt_value`` fields of
    the extra_dhcp_opt so strings with newline character are not valid for
    dhcp extra option's name nor value.
