Add free/paid quota contexts in specs.

Change-Id: I1ffcb3db6925fbb591bcc54dfd7c7f8f03b57c71
Add spec contexts for app creation and update.

Change-Id: Ib45d2cf8c47da27aeaa731357313c30523f706ee
Enforce quota check during app memory mutation.

Change-Id: Ia16fc0a7205ff482635d8c92e1a796b764f7156a