Increase rsyslog buffer sizes.

Swift proxy logs to syslog during the devstack-gate tempest runs. To
better capture the swift logs increase the rsyslog buffer size to 6k
bytes allowing for longer messages like tracebacks.

This was setup by openstack-infra previous during our diskimage
builds.

  I03e42964e14d9f930c07ed047851bdf775639c59

Change-Id: Iaa232335865410600c93f47d4777ed4f1bce08e2
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/lib/swift b/lib/swift
index 8b75fcc..16f398a 100644
--- a/lib/swift
+++ b/lib/swift
@@ -554,6 +554,7 @@
     if [[ $SYSLOG != "False" ]]; then
         sed "s,%SWIFT_LOGDIR%,${swift_log_dir}," $FILES/swift/rsyslog.conf | sudo \
             tee /etc/rsyslog.d/10-swift.conf
+        echo "MaxMessageSize 6k" | sudo tee /etc/rsyslog.d/99-maxsize.conf
         # restart syslog to take the changes
         sudo killall -HUP rsyslogd
     fi