Add extra tests to nametest

[odow]

Current tests weren't testing the edge-case where we rename variables/constraints.

ref jump-dev/Gurobi.jl#216, jump-dev/GLPK.jl#101

Also, it doesn't look like the modellike.jl tests are tested?

[codecov-io]

Codecov Report

Merging #833 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #833      +/-   ##
==========================================
+ Coverage   94.83%   94.85%   +0.02%     
==========================================
  Files          71       71              
  Lines        7643     7681      +38     
==========================================
+ Hits         7248     7286      +38     
  Misses        395      395

Impacted Files	Coverage Δ
src/Test/modellike.jl	99.38% <100%> (+0.05%)	⬆️

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[odow]

Bump. Barring objections, I'll merge this tomorrow.