hdf5_ep

[svn-r6548] Purpose:
New Feature

Description:
Some machine has a different hostname from its official name (e.g., copper
is called Cu12) and some machine name are dynamic aliases (e.g., titan is
mapped user01 or user02).  Some names are cryptic (who could remember
hn0? are platinum hosts while user0? are for titan).  We had to hardcode
those names into the snaptest.cfg file.  An ongoing maintenance PAIN.

Solution:
Added -configname <name> option where
   "use <name> as hostname in the parsing of the snaptest configure file"
Changed RSH code to append the hostname used in the Allhostfile.  Now, we
need not worry about machine name mapped to a different host and it is
much cleaner to match up entries between allhostfile and snaptest.cfg files.


Platforms tested:
Did not use h5committest which does not cover this code.
Tested in eirene, titan, platinum and copper.

Misc. update: