kvm: Logrotate should not touch agent.log (apache#3597)

Logrotate should only touch security_group.log and resizevolume.log
as the agent.log is already rotated by log4j inside the Agent.

Having two systems trying to rotate agent.log leads to all kinds of
issues like having binary (compressed) data in the middle of a plain-text
log file.

In addition we do not have to rotate the logs every day, only when they
grow larger than 10M. On fairly idle hypervisors this should not cause
those logs to rotate every day.

Signed-off-by: Wido den Hollander <wido@widodh.nl>

Author: wido

agent/conf/cloudstack-agent.logrotate.in

@@ -15,12 +15,11 @@
 # specific language governing permissions and limitations
 # under the License.
 
-@AGENTLOG@
-/var/log/cloudstack/agent/security_group.log
-{
+/var/log/cloudstack/agent/security_group.log /var/log/cloudstack/agent/resizevolume.log {
     copytruncate
     daily
     rotate 5
     compress
     missingok
+    size 10M
 }