identify jobs and packages to bundle collections by version+sha1

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
extract drain integration tests into their own file

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
add integration tests to verify that job templates are updated during bosh deploy

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>