v2.x: create_tarball.sh: update snapshot filename #2346
                
     Merged
            
            
          
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Nightly snapshots will now be named:
openmpi-${BRANCHNAME}-${YYYYMMDDHHMM}-${SHORTHASH}.tar.${COMPRESSION}.
Fixes #2337
Signed-off-by: Jeff Squyres jsquyres@cisco.com
(cherry picked from commit 78d1e4e)