Store built-in dnssec-policies in defaultconf

Store built-in dnssec-policies in defaultconf

Update the defaultconf with the built-in policies. These will now be
printed with "named -C".

Change the defines in kasp.h to be strings, so they can be concatenated
in the defaultconf. This means when creating a kasp structure, we no
longer initialize the defaults (this is fine because only kaspconf.c
uses dns_kasp_create() and it inherits from the default policy).

In kaspconf.c, the default values now need to be parsed from string.

Introduce some variables so we don't need to do get_duration multiple
times on the same configuration option.

Finally, clang-format-14 decided to do some random formatting changes.