Update a log stream to allow additional dumping

The update will take affect as each system obtains its first connection to the log stream. For example, assume there are two systems in an installation's sysplex, SYSA and SYSB, and SYSA had a connection to the log stream prior to the update request and SYSB did not have any connections to the log stream. If SYSB establishes a new (first) connection to the log stream, then the DIAG options will be in affect on SYSB. The DIAG settings prior to the update request will remain in affect on SYSA even if there is another connection to the log stream on SYSA. However, if all the connections to the log stream on SYSA are disconnected and then a new (first) connection is established to the logstream on SYSA, then the new DIAG options would then be in affect on SYSA.