1) I added code from Vern Staats that always forces ssh tunneling for all
   data connections. This code is dependent on VISIT_FORCE_SSH_TUNNELING,
   which is off by default. To enable forcing of ssh tunneling do one of
   the following:

   a) Add the line

         VISIT_OPTION_DEFAULT(VISIT_FORCE_SSH_TUNNELING ON)

      to your config site file.

   b) Run cmake with VISIT_FORCE_SSH_TUNNELING defined on the execute line
      as shown below.

      cmake . -DVISIT_FORCE_SSH_TUNNELING:BOOL=ON

2) I added code from Vern Staats that uses /dev/urandom to create the random
   seed used to generate the key used to set up data connections between
   components. The code is unix specific. This change and the change above
   resolve #702.



git-svn-id: http://visit.ilight.com/svn/visit/trunk/src@14795 18c085ea-50e0-402c-830e-de6fd14e8384