Add support for printing udev rules for usbdiskdirect port cameras (such as the st2205). Note that the udev rule applies to the /dev/sdx node instead of to the /dev/usb/.... one, as that is the one which needs to get its acl's set properly to allow users access. git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@12777 67ed7778-7388-44ab-90cf-0a291f65f57c