devtool: implement build-image plugin
Implemented new plugin to build image from workspace packages.
Plugin creates <image>.bbappend file, adds
all workspace packages to the image using IMAGE_INSTALL_append
variable in bbappend file. After that it runs 'bitbake <image>'.
(From OE-Core rev:
00bc43868da3ea2a4532215d3abef8e150c7b2e5)
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
