#2519 Update BPA replacement doc for Plinux support

[Brian Croswell]

We did add some steps in the BPC replacement scenarios about release the
IP address and executing the dadmin command in our xCAT Hardware Recovery doc
http://sourceforge.net/apps/mediawiki/xcat/index.php?title=Power_775_Cluster_Recovery#Frame_Down_Recovery_Procedure

(1)Admin will need to know the xCAT frame object name and whether the DHCP being replaced is on the A or the B side.
In the following examples, we are replacing the BPCH for the B-Side of "frame53"
lsdef -S bpa -w parent=frame53 -w side=B-0 -i mac
Object name: 40.53.0.2
mac=001a6454ef7e
(2) Verify the address is currently allocated to the BPCH:
dadmin -s | grep 001a6454ef7e
40.53.0.2 Leased 10:00:00 12/19 12:52 12/19 12:52 FALSE 1-001a6454ef7e
(3) Release the address:
dadmin -d 40.53.0.2
(4) Verify the address has been released

This documentation is good for AIX admin support .
The command dadmin is only used with AIX but not supported on RH/SLES Linux.
What are the supported commands in RH6 Linux that can help work with DHCP.
These steps need to be added into the Recovery steps where dadmin is referenced.
dadmin -s | 40.53.0.2
40.53.0.2 Free

[Le Yin]

Brian, there is no similar command on Linux for the user to release the DHCP assigned IP address. Usually manually adding or deleting entries in DHCP lease file will be the similar function. makedhcp will also do these things. I've updated the document to ask the reader to check lease file to verify the DHCP configuration.

[Brian Croswell]

Yin Ler did add data for recovery doscument