dnssec daemons: read the dns context config file for debug state
This had been hardcoded to debug=True but it spams the logs
with a lot of unnecessary information.
Allow it to be enabled for troubleshooting purposes but keep it
disabled by default.
Enabling debug would involve created /etc/ipa/dns.conf:
[global]
debug = True
I didn't add a more generic mechanism because for now we only need
the value of debug and it introduces a lot of type conversion
headaches. ipalib handles this automatically but to duplicate this
would be corner-case city.
Fixes: https://pagure.io/freeipa/issue/9128
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>