This patch fixes a problem in SQL reconnection algorithm which is managed in

This patch fixes a problem in SQL reconnection algorithm which is managed in
the db.c file for PgSQL and MySQL. In case of problem during request execution
a new connection to the database was immediatly started without closing the
previous one. The consequence was to block the database by having too much
simultaneous open connections.

This patch fixes the problem by disconnectinng from the database after a
request failure and trying to reconnect after a delay which is by default
of 2 secondes. This delay can be customized via the reconnect configuration
variable in the database configuration section.

Signed-off-by: Eric Leblond <eric@inl.fr>