Do not test lulesh with sedov15oct.lmesh under valgrind.
Merge pull request #848 from vasslitvinov/do-not-test-large-input-for-lulesh-valgrind

Do not test lulesh with --filename=lmeshes/sedov15oct.lmesh under valgrind.

* Change .execopts from a symlink to the release version
to a regular file, eliminating the line with the above option.

* Remove .timeout, as I expect the remaining .execopts
to execute quickly even under valgrind.

Testing for sedov15oct.lmesh takes about 20 minutes in the nightly testing.
Brad believes that it is unlikely to uncover any issues
that testing with sedov2cube.lmesh wouldn't.
The latter testing remains enabled and takes much less time.

Unfortunately with size=2, only the boundary conditions are computed.
Ideally we would also test with an input file where the size is larger.
At the moment this is not done because there are no such input files
in lmeshes/ subdirectory.