Add a 'wic list source-plugins' command enabling users to get a list
of valid partition --sources. This is useful not only for determining
sources to use in .wks partition statements, but also for making sense
of errors in .wks partition processing.
(From OE-Core rev: 37db9423e7872012fabde67e8858db5b512832f6)
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>