Use only half-reified constraints where appropriate (#34)

[lalithsuresh]

First cut at only creating half-reified constraints where appropriate.

[codecov-commenter]

Codecov Report

Merging #67 into master will decrease coverage by 0.32%.
The diff coverage is 63.82%.

@@             Coverage Diff              @@
##             master      #67      +/-   ##
============================================
- Coverage     80.74%   80.41%   -0.33%     
- Complexity     1050     1058       +8     
============================================
  Files            76       76              
  Lines          4633     4673      +40     
  Branches        484      504      +20     
============================================
+ Hits           3741     3758      +17     
- Misses          682      690       +8     
- Partials        210      225      +15     

Impacted Files	Coverage Δ	Complexity Δ
dcm/src/main/java/com/vmware/dcm/backend/Ops.java	76.26% <45.45%> (-4.88%)	113.00 <13.00> (+7.00)	⬇️
...ain/java/com/vmware/dcm/backend/OrToolsSolver.java	89.57% <89.47%> (-0.22%)	142.00 <2.00> (+1.00)	⬇️
...eduler/src/main/java/com/vmware/dcm/Scheduler.java	63.55% <100.00%> (+0.31%)	12.00 <0.00> (ø)

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