[Ocfs2-test-devel] ocfs2-test: changed to accept an alternate NIC to be used by the test.

[Marcos Matsunaga]

Due to some changes on how openmpi works and because it sometimes can't
deal with the public NIC if there is an alias created, there was a need
to make the scripts use an alternate NIC. 

These patches add this option to the multi-node test.

Also, I use a common partition to store logfiles. The logfiles names
on the acl, reflink and xattr were a little confuse and hard to visualize
when stored in the same place. I have made them all consistent and also
included the architecture to the logfile names. This way, it will be
easier to locate them.

Other than that, there are some really small cleanups that I made.

Signed-off-by: Marcos Matsunaga <Marcos.Matsunaga at oracle.com>