toaster: buildinfohelper Create a copy of the built layer and recipe

toaster: buildinfohelper Create a copy of the built layer and recipe

Create a copy of the built layer and the recipes associated with it.
This is so that the user can view the historical information about a
build. i.e. a snapshot of the layer version and artifacts produced at
that build.

Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: brian avery <avery.brian@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>