Description of problem:

Usability issue: make the instructions clearer by separating OS platforms.

The install instructions for 1.2.2 commingle Ubuntu, CentOS, RHEL system prep.  This has two drawbacks:

 - it is less than usable, it interrupts the workflow with extraneous detail (example: I do not need to to know to check if the network interfaces are up, *unless* I am running CentOS - today, everybody reads that detail)

 - it messages platforms other than RHEL to RHEL users. 

Resolution:

Install Guides should be separate by platform, with completely separate instruction streams, published on separate PDF docs.

This is so SAs do not need to advertise support for non-RHEL platforms where this is not needed, and so that the install streams can be crisp and not include extraneous details (SELinux on Ubuntu, interfaces on RHEL, etc) that one has to read if the instructions follow If (platform) else if (platform) else if (platform) flow they have today.