adding some UQ tests

[sotorrio1]

Fixes/Addresses:

Adding UQ tests to increase coverage

Summary/Motivation:

The motivation behind this effort is simply to increase the test coverage in all the LLNL maintained modules (UQ, OUU and SDoE).

Changes proposed in this PR:

• Fix couple of bugs in the base code
• Added some UQ tests. More to come.

Legal Acknowledgement

By contributing to this software project, I agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the copyright and license terms described in the LICENSE.md file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

❌ Patch coverage is 27.27273% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.87%. Comparing base (bb11943) to head (5e26aef).

Files with missing lines	Patch %	Lines
foqus_lib/gui/model/dmfUploadDialog.py	0.00%	4 Missing ⚠️
foqus_lib/gui/model/gatewayUploadDialog.py	0.00%	4 Missing ⚠️
foqus_lib/framework/graph/graph.py	0.00%	3 Missing ⚠️
foqus_lib/framework/optimizer/SM_Optimizer.py	0.00%	2 Missing ⚠️
foqus_lib/framework/uq/SampleData.py	33.33%	1 Missing and 1 partial ⚠️
foqus_lib/gui/uq/AnalysisDialog.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1272      +/-   ##
==========================================
+ Coverage   39.05%   39.87%   +0.82%     
==========================================
  Files         165      165              
  Lines       37745    37747       +2     
  Branches     5864     5865       +1     
==========================================
+ Hits        14740    15052     +312     
+ Misses      21879    21597     -282     
+ Partials     1126     1098      -28     

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