Vagrant dev: adding some usefull scripts for the vagrant user

Adding some usefull scripts for the vagrant user :

vagrant ssh
   00_bin/20_psql_access.to.the.database.sh 
   00_bin/30_database_reload.sh                  # Reload database   
   00_bin/50_TU_launch.unit.tests.sh             # Launch unit tests  
   00_bin/60_TF_launch.functional.tests.sh run   # Launch functional tests