[type __jail] do better version selection on freebsd > 9

Contributed by Shannon Prickett

cdist/conf/type/__jail/manifest

@@ -1,6 +1,8 @@
 #!/bin/sh -e
 #
 # 2012 Jake Guffey (jake.guffey at eprotex.com)
+# 2026 Shannon Prickett
+# 2026 Nico Schottelius
 #
 # This file is part of cdist.
 #
@@ -43,7 +45,7 @@ for property in *; do
 	set -- "$@" "--$property" "$(cat "$property")"
 done
 
-if grep -q '^10\.' "$(cat "$__global/explorer/os_version")" ; then   # Version is 10.x
+if grep -q '^[[:digit:]]\{2,\}\.' "$__global/explorer/os_version" ; then # Version > 9.x
    __jail_freebsd10 "$@"
 else
    __jail_freebsd9 "$@"
@@ -51,4 +53,3 @@ fi
 
 # Debug
 #set +x
-