Suppress requests/urllib3 connection pool log messages (#3854)

requests/urllib3 is notorious for using the INFO log level for very
DEBUG kinds of information. Given the configurability of python
logging it's actually pretty easy to just set requests to WARN by
default. This cleans out a bunch of largely unuseful log lines from
home assistant output.

homeassistant/bootstrap.py

@@ -355,6 +355,11 @@ def enable_logging(hass: core.HomeAssistant, verbose: bool=False,
     logging.basicConfig(level=logging.INFO)
     fmt = ("%(log_color)s%(asctime)s %(levelname)s (%(threadName)s) "
            "[%(name)s] %(message)s%(reset)s")
+
+    # suppress overly verbose logs from libraries that aren't helpful
+    logging.getLogger("requests").setLevel(logging.WARNING)
+    logging.getLogger("urllib3").setLevel(logging.WARNING)
+
     try:
         from colorlog import ColoredFormatter
         logging.getLogger().handlers[0].setFormatter(ColoredFormatter(