Date: 31-July-2018
- Add new keyword
- get_time_to_live_in_redis_second
- set_to_redis_hash
- delete_from_redis_hash
- redis_key_should_not_be_exist
- redis_hash_key_should_be_exist
- redis_hash_key_should_not_be_exist
- Change function name of 'check_if_key_exits' to 'redis_key_should_be_exist'