(legacy) kill "interface cache", let's not try to cache things that may change during the session... all for saving a ifconfig call.

related to, https://github.com/opnsense/core/issues/451 (try to avoid smilar issues)

(legacy) style cleanup rc.newwanip, don't try to loop back to configd if not needed. loosly related to https://github.com/opnsense/core/issues/451

(legacy) remove caching of filter interfaces, likely suspect of https://github.com/opnsense/core/issues/451

(legacy) fixup code style for filter.inc before performing actual change (missing curly braces, indents, etc)

(legacy, ntp serial) don't trigger set_gps_default on page load. closes https://github.com/opnsense/core/issues/436

IPsec phase 1: setting for rekey/reauth always overwritten, closes https://github.com/opnsense/core/issues/433

This reverts commit a193049d.
Was solved in FreeBSD kernel...