s3: smbtree: use client_messaging_context

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13465

Signed-off-by: Christof Schmitt <cs@samba.org>
15 jobs for slow-autobuild in 87 minutes and 21 seconds (queued for 8 seconds)
Name Stage Failure
failed
build_samba Build
/dev/xvda1        317594  3973    313605   2% /builds/samba-team/devel


### df -m /tmp/samba-testbase/b13
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/mapper/docker-202:1-258563-5c50977120328db976c778528b8a773a213f19de2f5e6c9f64b6778290fc429f 10229 2141 8089 21% /


ERROR: Job failed: exit code 1
failed
build_samba_ad_dc Build
/dev/xvda1        317594  3823    313755   2% /builds/samba-team/devel


### df -m /tmp/samba-testbase/b13
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/mapper/docker-202:1-258563-3bd3732fc55f5bec7835ee00854bb535b1c3c84ea3aadeb2ca418d31aa5aeac3 10229 1959 8271 20% /


ERROR: Job failed: exit code 1