apply_configuration: add configure_kasplist

apply_configuration: add configure_kasplist

The kasplist (dnssec-policy defined in the builtin and global
configuration options) was built inside apply_configuration. This
commit extracts this logic into its separate function.

In order to make the view configuration independent of the global
`server` object, the newly built kasplist is now passed as parameter.
(This eventually will help to be able to configure the views outside of
the exclusive mode by limiting its dependency to the global
`server`/`named_g_server`).