The db.api module provides a useless indirection to the only
implementation we ever had, sqlalchemy. Let's use that directly instead
of the wrapper.
Change-Id: I80353cfed801b95571523515fd3228eae45c96ae
Context is added as the first argument to stack_lock_* db functions
but is currently ignored for getting the session used for stack lock
operations.
This is required later for bug 1479723 but is added in its own change
here to ease reviewing load.
Change-Id: Ieb3e4e2ee67150777cbe1e961d0d1806cf1f7e46
Related-Bug: #1479723
When stack is in status IN_PROGRESS and engine service went down,
the status of stack will forever remain in IN_PROGRESS. This patch
add a db apid to get engine_id from stacklock and try to reset the
stack status to FAILED when engine is back.
Closes-Bug: #1382320
Change-Id: Ica856bb0d56c23a4423fb9476c1986aaacf24108
Thomas Herve