Fix loader phys dev termin for physical device extensions.

Fix loader phys dev termin for physical device extensions.

Fix some loader terminator functions for instance physical device
functions (that were pre-Vulkan 1.1).  At that point in the API, we
didn't treat VkPhysicalDevices like VkDevices.  Now, you must first
query the device for extension support for even VkPhysicalDevice calls.
Back then, the loader had to emulate the functionality.

Added tests to validate many of these functions.