agent: don't print TURN password unless the logging is verbose

Limits accidental leakage of secret information.
6 jobs for turnpwd in 9 minutes and 49 seconds (queued for 26 minutes and 14 seconds)
Status Job ID Name Coverage
  Build
passed #110302
build autotools

00:00:58

passed #110303
build meson

00:00:28

 
  Test
passed #110305
distcheck autotools

00:04:17

passed #110307
doc-and-install meson

00:00:45

passed #110304
test autotools

00:02:37

failed #110306
allowed to fail
test meson

00:00:42

 
Name Stage Failure
failed
test meson Test
0%: Checks: 1, Failures: 1, Errors: 0
gstcheck.c:391:F:nice:buffer_list_test:0: check pad_peer (0x12f8720) refcount is 3 instead of 2
-------

Full log written to /builds/xhaakon/libnice/build/meson-logs/testlog.txt
Uploading artifacts...
build/meson-logs/: found 4 matching files
Uploading artifacts to coordinator... ok id=110306 responseStatus=201 Created token=zbixANvN
ERROR: Job failed: exit code 1