Merge branch 'fix-bug-1' into f-server-side-scripting

src/caosdb/configuration.py

...onnection/authentication/external_credentials_provider.py

src/caosdb/connection/authentication/interface.py

src/caosdb/connection/authentication/keyring.py

src/caosdb/connection/authentication/pass.py

src/caosdb/connection/authentication/plain.py

unittests/test_authentication_external.py

unittests/test_authentication_keyring.py

unittests/test_authentication_pass.py

unittests/test_authentication_plain.py