Revision 1863024

Improved: Move ‘AdminServer’ inside a container
(OFBIZ-11136)

‘AdminServer’ provides a portable way to manage life-cycle of the OFBiz
process remotely by allowing administrator to check its running status
or shutting it down.

Previously the ‘AdminServer’ class was a special thread opening a
socket and launched at startup.  However since this class is about
managing some run-time resources with a life-cycle, it matches perfectly
the container abstraction.

A benefit of making ‘AdminServer’ a container is that the startup
process is now simpler and more uniform.

Administrators can now prevent remote shutdown of OFBiz for security
reasons by removing the container declaration.  Additionally They can
delegate the process management job to the init process (PID 0) of the
hosting system like Systemd [1] by replacing this container with
another one.

[1] https://www.freedesktop.org/software/systemd/man/systemd-notify.html