This PR fixes an issue occuring when you run a RunScript bconsole command from a job. The produced output from that bconsole command is inserted in the database joblog, hence performs a database query (insert). Its query result would then override the existing query result which produces wrong behaviour if the existing query result was not entirely processed at this point.

This PR creates a new method for database queries that does not store the query result hence does not override anything. We use this method for adding lines to the database joblog.

Fixes bareos/internal#238: admin job only prints first line of list result
Fixes bareos/internal#342: Provide resultset-less DB query function

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