Improvement : change YAML exodam syntax

[0.14.4-alpha] - 2021-05-10

Add

• Improve the test with pytest mark parametrize and assertpy
• Add a function to extract the name of the different objects in the objects part in yaml exodam file (extract_name_of_object)
• Add a function to delete from list of unknown the correct sg with regex yaml ^sg[1-9]+$
• Add a check for the gs part of a yaml exodam file

Change

• Modification of the pytest folder structure for clarity
• Change the syntax of yaml exodam file for the new version (cf Issue #26 (closed))

Fix

• Load the cerberus unknown check file in the master function to optimise the detect_unknwon_recurssive function
• The function detect_unknown now look if there are several times an unknown values and add only 1 time in the list of unknown values
• Add the type satellite in exo_type in different cerberus file and check file
• The function out_of_sg is undated change it for get_objects and get_gs