Rename CC staging.max_staging_runtime property to timeout_in_seconds

Bump cloud controller:

Eric Malm (3):
      Fix object identity in spec
      BuildpackBitsDelete takes the timeout instead of whole config
      Remove the hard-coded default for staging timeout

fraenkel (2):
      When updating build pack bits, delay blobstore deletions to allow current stagings to succeed.
      When updating build pack bits, delay blobstore deletions to allow current stagings to succeed.

[#64460322]

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