Change target naming convention, remove symlinks

Change target naming convention, remove symlinks

Move information from filename (argument $0) to a line parameter.
With introduction of testing path of 64-bit images for Minnowboards it
was easier to use single name for all operations (downloading, testing).

Currently supported target configurations:
 * odroid: arm-wayland (common-boot-armv7l-odroidu3,
   common-wayland-3parts-armv7l-odroidu3)
 * minnow32: ia32-wayland (common-wayland-efi-i586)
 * minnow64: x86_64-wayland (common-wayland-efi-x86_64)

Change-Id: I5c882a14d0ff4345376a477fd363ca0b6451f708
Signed-off-by: Aleksander Mistewicz <a.mistewicz@samsung.com>