populate_sdk_ext: add extensible SDK

This bbclass will create an SDK with a copy of bitbake and the metadata
and sstate for the target specified for the task. The idea is to let
"system" developers both work on applications and then test adding them
to an image without having to switch between workspaces or having to
download separate items.

Rather than running bitbake directly however, the primary way of running
builds within the extensible SDK is to use the "devtool" command. The
rest of the build system is fixed via locked shared state signatures,
and thus only the recipes you have added get built.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Randy Witt <randy.e.witt@linux.intel.com>
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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