Releases a connection for use by others. You may optionally specify how long the connection is valid to be reused. Values <= 0 are considered to be valid forever. If the connection is not marked as reusable, the connection will not be reused regardless of the valid duration. If the connection has been released before, the call will be ignored.
@param conn the connection to release
@param validDuration the duration of time this connection is valid for reuse
@param timeUnit the unit of time validDuration is measured in
@see #closeExpiredConnections()
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