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ctest: Add test selection based on sharding across nodes.

Daniel Wyatt requested to merge dewyatt/cmake:add-ctest-shard-test-selection into master

I'd like to get some feedback on this feature.

This is intended to be similar to gtest-parallel's --shard_count and --shard_index options.

As an example, if you wanted to run a portion of a test suite across 3 machines, you might do something like this:

  • Machine 1: ctest -R 'RunCMake.*' -IS 0,3
  • Machine 2: ctest -R 'RunCMake.*' -IS 1,3
  • Machine 3: ctest -R 'RunCMake.*' -IS 2,3

I think this is a pretty common scenario that is worth supporting in CTest.

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