abf98ae84a
Use the namedtuple class to improve code readability by creating a Host class with namedtuple to store the 'hostname' and 'port' Replace foo[0] with foo.hostname, and foo[1] with foo.port to make code more readable. Change-Id: Ie2b5f9cf89e7ccbbcf0a2573dab6f6c5d14c018b