Fix missing log-file arg for n-agents OCF

W/o this patch, neutron agents misplace their
logs to neutron-server.log file.
In order to fix it:
* use --log-file explicitely
  in OCF scripts for n-agents.
* remove redirection to log file to not duplicate
  the log records

Closes-bug: #x1371629

Change-Id: If209c66b39c1b51f4970b786604eb95ec38ff74e
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Merge "Fix missing log-file arg for n-agents OCF"