libcasper: fix descriptors numbers

Casper services expect that the first 3 descriptors (stdin/stdout/stderr)
will point to /dev/null. Which Casper will ensure later. The Casper
services are forked from the original process. If the initial process
closes one of those descriptors, Casper may reuse one of them for it on
purpose. If this is the case, then renumarate the descriptors used by
Casper to higher numbers. This is done already after the fork, so it
doesn't break the parent process.

Approved by: so
Security: EN-21:19.libcasper
PR: 255339
Reported by: Borja Marcos <borjam (at) sarenet.es>
Tested by: jkim@

(cherry picked from commit aa310ebfba3d49a0b6b03a103b969731a8136a73)
(cherry picked from commit 934e10b4a388b13c2bcd8fbac8cd8cc4a641b1b0)