Added responsetimeout option to all available command-line tools for supporting to possibly impose a timeout on waiting for the results of remote invocations to Open-Xchange server. This prevents from waiting forever when executing a command line invocation directed to a server instance that is currently overloaded/stalled and therefore cannot serve the remote method invocation in time; see bug #37741.

Thus, all existing command-line tools that are based on RMI/JMX are enhanced by the following option:

--responsetimeout <arg> response timeout in seconds for reading response from the backend (default 0s; infinite)