setup-environment-internal: Fix machine setup
setup-environment-internal: Fix machine setup

When we have setup for one machine and would like to switch
to use another machine. It did not allow that. Now we can do so

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

Angstrom-distribution/angstrom-manifest,twoerner/angstrom-manifest,koenkooi/angstrom-manifest,ndechesne/qcom-oe-manifest,96boards/oe-rpb-manifest,linaro-home/lhg-oe-manifests