Add log error if we run salt-api w/ no config
Add log error if we run salt-api w/ no config

Currently, the salt-api script will exit with no error or hint of why it
failed if there is no netapi module configured.  Added a short line if
we find no api modules to start, warning the user that the config may be
missing.

Fixes #28240

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt