s3:debug: enable logging for early startup failures

Commit c89a33a0 'debug: Use backends instead of explicitly logging to
syslog or file' introduced a regression where early startup failures (e.g.
unable to connect to CTDB) are no longer logged because the debug subsystem
is not yet fully initialized. Enable logging again with reasonable defaults
when reopen_logs() is called and the parameter file is not yet parsed.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13904

Signed-off-by: Ralph Wuerthner <ralph.wuerthner@de.ibm.com>
24 jobs for rawue-logging in 48 minutes and 25 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #198723334
docker shared
ctdb

00:36:18

passed #198723314
docker shared
others

00:11:45

passed #198723315
docker shared
samba

00:21:45

passed #198723341
docker private samba-ci-private
samba-ad-dc-1

00:41:06

passed #198723323
docker shared
samba-ad-dc-2

00:47:57

passed #198723325
docker shared
samba-ad-dc-3

00:39:08

passed #198723326
docker shared
samba-ad-dc-4

00:44:57

passed #198723328
docker shared
samba-ad-dc-5

00:37:06

passed #198723330
docker shared
samba-ad-dc-6

00:34:10

passed #198723331
docker shared
samba-ad-dc-backup

00:38:15

passed #198723336
docker shared
samba-ad-dc-ntvfs

00:37:23

passed #198723322
docker shared
samba-ad-member

00:21:36

passed #198723335
docker shared
samba-ctdb

00:18:59

passed #198723338
docker private samba-ci-private
samba-fileserver

00:24:39

passed #198723332
docker shared
samba-libs

00:32:43

passed #198723316
docker shared
samba-none-env

00:48:24

passed #198723317
docker shared
samba-nopython

00:29:25

passed #198723318
docker shared
samba-nopython-py2

00:36:47

passed #198723342
docker private samba-ci-private
samba-nt4

00:38:41

passed #198723321
docker shared
samba-o3

00:31:02

passed #198723343
docker private samba-ci-private
samba-schemaupgrade

00:33:45

passed #198723333
docker shared
samba-static

00:39:59

passed #198723319
docker shared
samba-systemkrb5

00:14:52

passed #198723320
docker shared
samba-xc

00:04:58