changed s3cli to take existing bosh configuration

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
added build-linux-amd64

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
inlined config fixture

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>