Rip out setting of the log level from udev_new and put it in a new function

This function is internal to systemd code, so external users of libudev
will not see those log messages. I think this is better. If we want to
allow that, the function could be put in libudev and exported.

v2: check that the string is more than one char before stripping quotes

src/shared/udev-util.h

@@ -42,3 +42,5 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(struct udev_monitor*, udev_monitor_unref);
 #define _cleanup_udev_ctrl_msg_unref_ _cleanup_(udev_ctrl_msg_unrefp)
 #define _cleanup_udev_monitor_unref_ _cleanup_(udev_monitor_unrefp)
 #define _cleanup_udev_list_cleanup_ _cleanup_(udev_list_cleanup)
+
+int udev_parse_config(void);