Introduced logging in case of plugin load error

Created by: stefanoborini

Small PR that introduces basic logging in case of error at loading. Unfortunately it's not possible to retrieve the traceback, but the exception message and the exception should be a good hint.

Created by: codecov-io

Codecov Report

Merging #50 into master will increase coverage by 26.53%. The diff coverage is 90.9%.

@@            Coverage Diff             @@
##           master     #50       +/-   ##
==========================================
+ Coverage   48.57%   75.1%   +26.53%     
==========================================
  Files          53      56        +3     
  Lines         700     723       +23     
  Branches       45      46        +1     
==========================================
+ Hits          340     543      +203     
+ Misses        350     169      -181     
- Partials       10      11        +1

Impacted Files	Coverage Δ
force_bdss/bdss_application.py	87.5% <90.9%> (+41.07%)
...ugins/dummy/dummy_data_source/dummy_data_source.py	60% <0%> (ø)
...dummy/dummy_data_source/dummy_data_source_model.py	100% <0%> (ø)
...ummy/dummy_data_source/dummy_data_source_bundle.py	63.63% <0%> (ø)
...ore_plugins/dummy/dummy_dakota/dakota_optimizer.py	36.36% <0%> (+36.36%)
...re_plugins/dummy_mco/dakota/dakota_communicator.py	37.5% <0%> (+37.5%)
...lugins/dummy_kpi/kpi_adder/kpi_adder_calculator.py	38.46% <0%> (+38.46%)
...tractor/csv_extractor/csv_extractor_data_source.py	40% <0%> (+40%)
..._plugins/dummy/dummy_dakota/dakota_communicator.py	46.15% <0%> (+46.15%)
... and 20 more

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