Update clique.py: Add local Composite

[pierrelouisp]

• Add local _ScaleComposite for use with the DWaveCliqueSampler.
• Extends the ScaleComposite class to local _ScaleComposite by checking for per_qubit_coupling_range violation and rescales accordingly.
• Fixes https://github.com/dwavesystems/dwave-system/issues/404

[pierrelouisp]

• Add local _QubitCouplingComposite to scale problem according to the per qubit coupling range when that range is exceedeed.
• Fixes https://github.com/dwavesystems/dwave-system/issues/404

[arcondello]

Approach looks good. Can we add some tests? It should be possible to adapt the mock sampler and tests in https://github.com/dwavesystems/dwave-system/blob/master/tests/test_dwavecliquesampler.py to create a breaking case.

[codecov-commenter]

Codecov Report

Merging #417 (efb5461) into master (fb38541) will decrease coverage by 1.63%. The diff coverage is 58.82%.

@@            Coverage Diff             @@
##           master     #417      +/-   ##
==========================================
- Coverage   92.11%   90.48%   -1.64%     
==========================================
  Files          22       22              
  Lines        1332     1366      +34     
==========================================
+ Hits         1227     1236       +9     
- Misses        105      130      +25     

Impacted Files	Coverage Δ
dwave/system/samplers/clique.py	78.61% <58.82%> (-5.39%)	:arrow_down:
dwave/system/samplers/dwave_sampler.py	84.37% <0.00%> (-3.13%)	:arrow_down:
dwave/system/samplers/leap_hybrid_sampler.py	74.45% <0.00%> (-2.92%)	:arrow_down:
dwave/system/composites/embedding.py	95.85% <0.00%> (-1.19%)	:arrow_down:

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