Kokkos Variant Name

Nobody has claimed this yet.

In implementing #615 I noticed that the Kokkos_Lambda variant may be using the Lambda part of its name a little differently than its used in the rest of the suite so filtering on it in the same way may not be what is intended. In the rest of the suite Lambda means an implementation in the baseline programming model that uses a lambda instead of whatever was used in Base. In the case of Kokkos lambda its using the kokkos programming model and kokkos is handling the backend. It might be more consistent with the rest of the suite to call this just Kokkos, or to call it something like Kokkos_Dynamic if Kokkos is dynamically deciding what backend to use based on what hardware is available. For now variant filtering with variants for Lambda will include or exclude Kokkos_Lambda.

Review issue #615 and the existing variant-filtering rules for Lambda and Kokkos_Lambda. Determine which naming convention the suite should use and how filtering should treat the variant; done means the naming and filtering behavior have an agreed, consistent definition.

Written by the indexing model from the issue text.