/vpp/src/tools/vppapigen/vppapigen:823: DeprecationWarning:
the imp module is deprecated in favour of importlib;
see the module's documentation for alternative uses
Change-Id: If7729778374e9193f6381c8bd2ed34c875db3f1e Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>