WL#1069: Re-initialize Prepared Statement

Our customers configure their connects to the server such that they lower wait
timeout so as to not increase thread count in the server.

With the current prepared statement code this causes a problem in that as soon
as they disconnect they lose their prepared statement and must re-issue it on
their own.

This should be handled by the client library. If a disconnection has occured and
the PS is no longer in the server then the client should recreate it.

So this logic:
Connect;
Create PS
Use PS
!disconnect occurs
Client makes a request with the PS, reissue the PS to the server, continue on
with the clients request.

This is related to, but not the same as the worklog entry for caching PS. That
will come in a later version (possibly 5.0).