In addition to the standard file name input (for example "vpe"),
binary API generator now again accepts full file path like
"/usr/share/vpp/api/core/vpe.api.json" as an input direcotry or
argument.
Change-Id: I591b5d26e7f101cdcc4af64d3bdabaab48b5b2ef Signed-off-by: Vladimir Lavor <vlavor@cisco.com>