populate_sdk_ext: Change lockedsigs task mismatch to a warning
It has been determined that it is highly likely that users might get
signatures that don't match in an extensible sdk. This doesn't
necessarily happen with oe-core, so we can set the mismatch to an error
during testing if we like.
However, for the case where users are creating their own sdks, we don't
need an error halting their progress. locked-sigs will still function as
it should.
Signed-off-by: Randy Witt <randy.e.witt@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
