Feature/zephyr

[jackraymond]

Added Zephyr topology support to DWaveMockSampler which can be the basis for further development of code supporting forthcoming Zephyr features.

[jackraymond]

AttributeError: module 'dwave_networkx' has no attribute 'zephyr_graph' is the cause of test failures. I think this is an issue with the required version for the repository.

[randomir]

@jackraymond, be sure to also update requirements in setup.py#L30 to dwave-networkx>=0.8.10, and in requirements.txt#L5 to dwave-networkx==0.8.10.

[codecov-commenter]

Codecov Report

Merging #432 (c506d05) into master (ddb219f) will decrease coverage by 3.03%. The diff coverage is 73.68%.

@@            Coverage Diff             @@
##           master     #432      +/-   ##
==========================================
- Coverage   90.54%   87.51%   -3.04%     
==========================================
  Files          22       22              
  Lines        1492     1498       +6     
==========================================
- Hits         1351     1311      -40     
- Misses        141      187      +46     

Impacted Files	Coverage Δ
dwave/system/testing.py	94.82% <73.68%> (-1.54%)	:arrow_down:
dwave/system/samplers/leap_hybrid_sampler.py	61.72% <0.00%> (-13.88%)	:arrow_down:
dwave/system/samplers/clique.py	77.35% <0.00%> (-5.04%)	:arrow_down:
dwave/system/samplers/dwave_sampler.py	84.47% <0.00%> (-3.11%)	:arrow_down:
dwave/system/composites/embedding.py	95.85% <0.00%> (-1.19%)	:arrow_down:

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