Test copying data from/to tightly sized buffers

Test copying data from/to tightly sized buffers

New tests were added to verify that the source and destination buffers
in vkCmdCopyBufferToImage and vkCmdCopyImageToBuffer respectively can
be just large enough to contain the accessed elements, specifically in
cases where the buffer size is not a multiple of buffer row length.

New tests:

dEQP-VK.api.copy_and_blit.*.image_to_buffer.tightly_sized_buffer
dEQP-VK.api.copy_and_blit.*.image_to_buffer.tightly_sized_buffer_offset
dEQP-VK.api.copy_and_blit.*.buffer_to_image.tightly_sized_buffer
dEQP-VK.api.copy_and_blit.*.buffer_to_image.tightly_sized_buffer_offset

Components: Vulkan

VK-GL-CTS issue: 1124

Change-Id: Ice8f542a37bc45f969e33eb148ad0e77f40f8dd8