[MAINT/TST] move misplaced results files in regressions/tests

[jbrockmendel]

Split off from #4932.

[coveralls]

Coverage decreased (-0.03%) to 84.168% when pulling b5e0787 on jbrockmendel:misplaced_reg into a764908 on statsmodels:master.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@8c9e6ea). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #5012   +/-   ##
=========================================
  Coverage          ?   81.95%           
=========================================
  Files             ?      589           
  Lines             ?    93312           
  Branches          ?    10369           
=========================================
  Hits              ?    76478           
  Misses            ?    14434           
  Partials          ?     2400

Impacted Files	Coverage Δ
statsmodels/regression/tests/test_regression.py	96.6% <100%> (ø)
...odels/regression/tests/test_quantile_regression.py	100% <100%> (ø)
statsmodels/regression/tests/test_lme.py	99.46% <100%> (ø)

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[bashtage]

Rebase, verify Lint, and it will get in.

[jbrockmendel]

travis fail looks like an unrelated network problem