pkitool lacks expected option "--help"

The pkitool script lacks the "--help" parameter to actually display the
usage statement; most people are conditioned to try that before running the
command without options. This patch adds that and "--version" to display
just the program name and version.

sf.net tracker:
<https://sourceforge.net/tracker/?func=detail&atid=454721&aid=1705407&group_id=48978>

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>
Acked-by: Jan Just Keijser <janjust@nikhef.nl>

easy-rsa/2.0/pkitool

@@ -192,6 +192,12 @@ while [ $# -gt 0 ]; do
 		     $PKCS11TOOL --module "$PKCS11_MODULE_PATH" --list-objects --login --slot "$PKCS11_SLOT"
 		     exit 0;;
 
+        --help|--usage)
+                    usage
+                    exit ;;
+        --version)
+                    echo "$PROGNAME $VERSION"
+                    exit ;;
 	# errors
 	--*        ) die "$PROGNAME: unknown option: $1" ;;
 	*          ) break ;;