Fix tests from Gurobi #216

[odow]

These two changes were needed to get jump-dev/Gurobi.jl#216 passing.

The first is because Gurobi elects to run infeas_certificates=false, but still finds a partial certificate so ResultCount is 1.

The second is a bug. The variables need to be mapped to be valid.

[codecov-io]

Codecov Report

Merging #763 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #763      +/-   ##
==========================================
+ Coverage   94.33%   94.35%   +0.01%     
==========================================
  Files          57       57              
  Lines        6226     6248      +22     
==========================================
+ Hits         5873     5895      +22     
  Misses        353      353

Impacted Files	Coverage Δ
src/Test/UnitTests/basic_constraint_tests.jl	98% <ø> (ø)	⬆️
src/Test/contlinear.jl	100% <ø> (ø)	⬆️
src/Test/modellike.jl	99.05% <100%> (+0.02%)	⬆️
src/Bridges/Constraint/soc_to_psd.jl	100% <0%> (ø)	⬆️

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