serivce_env_var: Rename get_all() to get_all_by_application()
serivce_env_var: Rename get_all() to get_all_by_application()

Change-type: major
Signed-off-by: Trong Nghia Nguyen <8e1f45cdcce8e4aef30b6ef5f5ba85d3ec052bb0@gmail.com>

resin-io/resin-sdk-python,resin-io/resin-sdk-python