Added current incorrect tests in the skipfiles
Naive Bayes: Updated tests for new MADlib commit c2cd5ca

Updated tests that correctly check the accuracy of the Naive Bayes
result. Also commented out the workaround tests since they are not the
right way to test the Naive Bayes results. We still need to add
results from external toolset to compare the absolute results from
MADlib.
Made more changes to skip_knowissues to test if kmeans tests are skipped
Generic CV: Add new test cases for cross-validation module

Added various new testcases, UDF wrapper functions, and updated the
sql.template files to reflect testing the cross-validation module
for linear and logistic regression. Cleaned the yaml files to remove
new module yaml files that were added accidentally.
Naive bayes: Commented pg test file
Changed dataset config.yaml to include data loading for all modules
PLDA init_cases updated
Test for Linear Regression w/ grouping & heteroskedasticity

Added input and output tests for Linregr with grouping and
heteroskedasticity BP test support.
Test for Linear Regression w/ grouping & hetero: Merge schedule file

Copied the case names into list_dev_regression, and then deleted the
individual schedule file for linrege w/ grouping and hetero...