The "idle_timeout" name and documentation are misleading to users.
Rename the option to connection_recycle_time to more closely
match that of the underlying SQLAlchemy argument name
"pool_recycle", which refers to a time period for which
a connection present in the pool for longer than that number
of seconds will be closed and replaced with a new one *upon checkout*,
to prevent usage of stale connections that may have been closed by
server-side reapers.
Change-Id: I5e39d5ac81eaa8d85b1dfb18862fe27695ab8b96
6634218415