strip \n if it was incorrectly added by the device

+        # Devices should _not_ be including a newline at the end of each log-line str (especially when
+        # encapsulated as a LogRecord).  But to cope with old device loads, we check for that and fix it here:
+        if line.endswith("\n"):
+            line = line[:-1]

Also: auto reformatting per our trunk formatting rules.

Author: geeksville