in DICT_VENDOR, name is "name", not "vendorname"

	in DICT_VENDOR, name is "name", not "vendorname"

	dict_vendorname is a bad name.  Use dict_vendorbyname for compatibility
	with other dictionary functions.

	Add dict_vendorbyvalue

	When printing names for unknown attributes, use vendor name, if
	it exists.  Cisco-Attr-1 is easier to read than Vendor-9-Attr-1