freebsd-version(1): Disable pathname expansion in -j option

Set the -f flag to sh(1) to disable pathname expansion.
Also, quote the jail variable to ensure correct behavior when passed
to jexec(8).

Signed-off-by:	Nami Arjmandi <namiarjmandi@gmail.com>
Reviewed by:	pouria
Pull-Request:	https://github.com/freebsd/freebsd-src/pull/2158

bin/freebsd-version/freebsd-version.sh.in

@@ -26,7 +26,7 @@
 #
 #
 
-set -e
+set -ef
 
 USERLAND_VERSION="@@REVISION@@-@@BRANCH@@"
 
@@ -88,7 +88,7 @@ userland_version() {
 #
 jail_version() {
 	for i in $jail; do
-		jexec -- $i freebsd-version
+		jexec -- "$i" freebsd-version
 	done
 }