Add ability to set debug level

Each contrail service can be configured with its own
level of debug. These services can be configured:

  contrail-collector
  contrail-query-engine
  contrail-topology
  contrail-snmp-collector
  contrail-vrouter-agent
  contrail-device-manager
  contrail-analytics-api
  contrail-alarm-gen
  contrail-dns
  contrail-svc-monitor
  contrail-control
  contrail-api
  contrail-schema

Closes-bug: #PROD-34313

Change-Id: Ic20e7ac45797a82154ef124aebbab052b5b01b5f
15 files changed