As part of the transition to multi-arch, replacing the
use of 'uname -m' to determine architecture and use
go env GOARCH consistently post 1.1.x. This will enable us to
use manifest templating to publish our multi-arch
manifest lists.

Had to skip a test in core/chaincode/platforms/util
until such time as we have published multi-arch to test.

Also, delete the scripts/bootstrap-1.1.0-preview.sh
as this is no longer needed going forward.

added .txt to check_license.sh exceptions

Change-Id: I91dec3a70105ecc3ac216832c735bfd0c4cf3baa
Signed-off-by: Christopher Ferris <chrisfer@us.ibm.com>