pfSense/pfsense f8d1fe0src/etc/inc pfsense-utils.inc

Filter properly the know variables in loader.conf.

The know variables should be used as prefix not as literals.

(cherry picked from commit 21bacf010021d34012f6869ce1d55268fad7b0ec)
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+8-1src/etc/inc/pfsense-utils.inc
+8-11 files

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