OPNSense/core a4a7383src/etc/inc interfaces.inc, src/www interfaces.php

interfaces: simplifications for dhclient #2372

Remove the dhclient "handlers" and use the PID file
like everything else.  The pid file is already there
under the same name, but we make it explicit in
case something changes or code needs to be traced.

(cherry picked from commit 65186994744db703e01c1addb4d31be514a145e3)
DeltaFile
+19-54src/etc/inc/interfaces.inc
+0-5src/www/interfaces.php
+19-592 files

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