Merge pull request #118 from telefonicaid/feature/convop_ngsi9_ContextEntityTypeAttributeContainer

Feature/convop ngsi9 context entity type attribute container
FIX small bug in unit test and tunning lcov for unit test covergage
Merge pull request #119 from telefonicaid/bug/unit_test_fix

FIX small bug in unit test and tuning lcov for unit test covergage
Merge branch 'develop' into feature/convop_ngsi9_ContextEntityTypeAttribute