General cleanups all around (janitoring) (#63)

* Move tests to device-type specific test files to make improvements more approachable

* protocol: remove the port parameter from query, as there are no other known ports, fix docstrings

* Revise docstrings, remove superfluous information and remove unused methods ({set,get_icon} and set_time)

* cli: indent device output to make it more easily readable when having multiple devices

* remove adjust flake8 ignores (we have no setup.py anymore)

* pyproject: include cli tool to coverage, add config for interrogate (docstring coverage)

* bulb: raise exception on color_temp error cases instead of returning zero values

* improve bulb tests, simplify conftest

* strip: rename plugs property to children and move it to smartdevice

kasa/discover.py

@@ -62,6 +62,7 @@ class _DiscoverProtocol(asyncio.DatagramProtocol):
             self.transport.sendto(encrypted_req[4:], self.target)  # type: ignore
 
     def datagram_received(self, data, addr) -> None:
+        """Handle discovery responses."""
         ip, port = addr
         if ip in self.discovered_devices:
             return
@@ -82,10 +83,11 @@ class _DiscoverProtocol(asyncio.DatagramProtocol):
             _LOGGER.error("Received invalid response: %s", info)
 
     def error_received(self, ex):
+        """Handle asyncio.Protocol errors."""
         _LOGGER.error("Got error: %s", ex)
 
     def connection_lost(self, ex):
-        pass
+        """NOP implementation of connection lost."""
 
 
 class Discover: