fix loggerIgnore issue and add unit tests

[netbsd8]

Note: this PR is now in pre-review state. Before running a official review, there are a couple of issue are need to be understanding:

1. how to mock a lambda object
2. error for "object MagicMock can't be used in 'await' expression"

This PR tries to fix the previous ignoring inputed logger issue mentioned here:
#56

It did the follows:

1. Finding all occurences of instanciations of DNSClient and pass the logger as part of the context.
2. Testing to confirm that a mocked DNSClient is called with logger passed to it.
3. Creating DNSClient tests test/test_protocol.py where DNSClientProtocol{UDP,TCP} would be mocked and ensuring that DNSClient passes the logger to them.
4. Replacing logger.debug with logger.exception in DNSClientProtocolUDP's error_received().

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[chantra]

Thanks @netbsd8