classes/populate_sdk_ext: properly handle buildtools install failure

If the buildtools installation failed, we were using a subshell instead
of a compound command and thus the subshell exited but the script
continued on, which is really not what we want to happen. Additionally
log the buildtools installer output to a file and cat it if it fails so
that you can actually see what went wrong, as well as amending the
environment setup script to print a warning as we do when the
preparation fails.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

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