Fixes bug 1160442
The defualt parameters are used unless otherwise configured. This
is applicable for:
- pool_size
- max_overflow
- pool_timeout
By increasing the pool_size and the max_overflow and lowering the timeout
the issue reported in the bug is resolved.
NOTE: the configuration values enable the user to make use of the default
QueuePool tuning values.
Change-Id: Ic258442531a2caf2db4f05c4ddd6fbfb0c180f17