+++ This bug was initially created as a clone of Bug #1003536 +++

Description of problem:
if rpc.mountd specify options: "-N 2 -N 3 -N 4", should output more readable info to user

Version-Release number of selected component (if applicable):
all version from RHEL5.9 RHEL5.10 RHEL6.x RHEL7.0

How reproducible:
y

Steps to Reproduce:
1. 
2.
3.

Actual results:
[root@dell-pr7610-01 ~]# rpc.mountd -N 2 -N 3 -N 4
Usage: rpc.mountd [-F|--foreground] [-h|--help] [-v|--version] [-d kind|--debug kind]
        [-o num|--descriptors num] [-f exports-file|--exports-file=file]
        [-p|--port port] [-V version|--nfs-version version]
        [-N version|--no-nfs-version version] [-n|--no-tcp]
        [-H ha-callout-prog] [-s|--state-directory-path path]
        [-g|--manage-gids] [-t num|--num-threads=num]

Expected results:
should output info to notify user, why error:
example: your can not disable all version of mountd

Additional info:

--- Additional comment from Yin.JianHong on 2013-09-02 06:01:49 EDT ---

[root@dell-pr7610-01 ~]# rpc.mountd --no-nfs-version 2 --no-nfs-version 3 --no-nfs-version 4
Usage: rpc.mountd [-F|--foreground] [-h|--help] [-v|--version] [-d kind|--debug kind]
        [-o num|--descriptors num] [-f exports-file|--exports-file=file]
        [-p|--port port] [-V version|--nfs-version version]
        [-N version|--no-nfs-version version] [-n|--no-tcp]
        [-H ha-callout-prog] [-s|--state-directory-path path]
        [-g|--manage-gids] [-t num|--num-threads=num]