Standardize blas lapack handles

[rfhaque]

This PR standardizes the names of the blas and lapack handles for all application experiment.py files tp 'default-blas and 'default-lapack. It also adds these handles to each system.py if needed.

Adding/modifying a system (docs: Adding a System)

• Add/modify systems/system_name/system.py file

Adding/modifying a benchmark (docs: Adding a Benchmark)

• Add/modify an experiments/benchmark_name/experiment.py to define a single node and multi-node experiments

[pearce8]

@becker33 I need you to weigh in on how we should be setting this up. This PR touches on a portion of the discussion we had in #551.