quality of life improvement: kea-admin db-version fails on empty db
kea-admin db-version prints the following error:
# kea-admin db-version mysql
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1146 (42S02) at line 1: Table 'keatest.schema_version' doesn't existwhen run on an empty DB (without any schema).
Instead, it should catch the fact that schema_version does not exist and should point user to kea-admin db-init command.
This is a quality of life improvement, so it's not terribly important.
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