skip redeploying micro bosh when ami did not change

Signed-off-by: Dmitriy Kalinin <dmitriy@pivotallabs.com>
Make private methods private

Signed-off-by: Jesse Zhang <jz@pivotallabs.com>
Prefer single quotes and interpolation

Signed-off-by: Jesse Zhang <jz@pivotallabs.com>
removed stale comment - used for fetch_logs

Signed-off-by: Dmitriy Kalinin <dmitriy@pivotallabs.com>
formatting

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