db.sqlalchemy.session add [sql].idle_timeout

Keystone is using idle_timeout in the [sql] section for the
idle timeout. Before Keystone can use oslo-incubator's
db.sqlalchemy.session we'll need to be able to have the old
option still be usable but deprecated.

bp use-common-oslo-db-code

Change-Id: Ic3dd4ec7f678f9564597830f9e4764d979a5d18a
fixed typos

Change-Id: Iee7fa515e3c551af6697fcacec88d61a7a023bb2
Pin sphinx to <1.2

There is a bug in sphinx 1.2 that breaks doc builds.

See requirements commit 0e8862e958813a031fe7398440e8a3866b42a8e4
for details.

Related-Bug: 1259511

Change-Id: I50c2102ed3c088254d1c03638ebe585d9dfe6622
Merge "db.sqlalchemy.session add [sql].idle_timeout"