want to run /etc/rc.d/rc.local in system boot time

I doubt this is the best approach to get this working.

There are tools for this jobs!

You can try adding an entrance to /etc/fstab <--- if the nfs share is permanent this is the right way

or (the one I usually use)

Use autofs: default install usually automount all exported shares in the /net folder following this scheme /net/$host/$shared_folder

Therefore you could just make a symling with

ln -s /net/$host/test_nfs /mnt/test_name

This way, every time you use the folder /mnt/test_name autofs will automount the nfs share for you and you are good to go

This approach avoids the lockup in case there's a network failure

You must remember to add the ip address to your /etc/hosts file like:

192.168.174.134 name_you_want

Regards