ansible: avoid huge docker container logs of Trove.
ansible: avoid huge docker container logs of Trove.

For the current Docker engine we use, container logs won't be shrunk
with an elegant method. And Trove services always producing plain log
files, so we can safely disable Docker container logs by disabling
logging to stderr.

Signed-off-by: Zhao Chao <abb6a2f7e4fabebf6d227485f53d7acf834f1da2@gmail.com>

eayunstack/eayunstack-upgrade,eayunstack/eayunstack-upgrade,eayunstack/eayunstack-upgrade,eayunstack/eayunstack-upgrade