Added and Updated unit tests for cfg_agent code base.

Details:
* Updated unit tests including
	1) test_cfg_agent
	2) test_device_status
  	3) test_csr1kv_routing_driver
	4) test_routing_service_helper
* Updated line break in csr1kv_snippets
* Added all_routers_flag in routing_service_helper
* Touched other test files

Change-Id: I08cc82db8e0d679173c02ce4b71aa0532c24e893