Add linux attribute collection module and json routes to get the new attributes
Merge branch 'develop' into collect-linux-attributes
Removed a debug message
Changes based on review comments
Merge branch 'develop' into collect-linux-attributes
Add unittest with mock for linux_os.py
Removed whitespaces in mock_txt/ifconfig.txt
Changes based on review comments
Attribute collector to collect all attrs and write to stdout (for SSH client)
Review comments
Correction: should print to sys.stdout instead of sys.stderr
Define STDOUT='-'