pfSense

Review license / copyright on all files (1st round)

Fix #5890 find disk slices as candidates for loading "config.xml" at boot

In commit 873c1701, the call to "/bin/ls /dev/{$disk}s*" was surrounded
with "escapeshellarg" so the wildcard is not expanded.

Use "glob" to find the slices for a disk instead.

Move main pfSense content to src/