[docker] let the ssh daemon speak for itself and drop the syslog daemon (#6529)

The sshd flag `-e` instructs sshd to output any logs to stderr instead
 of the syslog. Redirect this output to stdout then.

Signed-off-by: Jakob Ackermann <[email protected]>

Author: das7pad

docker/etc/s6/openssh/run

@@ -2,5 +2,5 @@
 [[ -f ./setup ]] && source ./setup
 
 pushd /root > /dev/null
-    exec su-exec root /usr/sbin/sshd -D
+    exec su-exec root /usr/sbin/sshd -D -e 2>&1
 popd