* Update config/main.py to verify if a config input file is properly formatted before writing it into confib_db. Support /dev/stdin as an input that can be validated
* Update tests/config_test.py to include test cases for invalid input file
* Add tests/config_reload_input/config_db_invalid.json as invalid input file used in tests/config_test.py

Signed-off-by: cchoate54@gmail.com