agent: honour listen-only-* flags

[ymartin-ovh]

Fix incorrect settings read, does not match cli config in the same file

[ymartin-ovh]

Address issue #3

[vrisk]

Hi - this is really a read-only copy of our working repository. It is not actively monitored. Can you put your issues into our working repo at https://gitlab.isc.org/isc-projects/stork/-/issues?

Thank you!

[ymartin-ovh]

https://gitlab.isc.org/isc-projects/stork/-/issues/536

[fivitti]

It was merged in https://gitlab.isc.org/isc-projects/stork/-/issues/536 by https://gitlab.isc.org/isc-projects/stork/-/merge_requests/310 MR.