[MSC-204] Fixing container shutdown freeze if shutdown is intiated during container boot process #64
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…er have been shutdown. It is necessary to detect container shutdown during the service installation phase because container can be shutdown even at its boot phase. Before this fix it was possible to shutdown the container executor and still have pending tasks in its queue. As consequence of this premature executor shutdown it sometimes happened that last executed tasks might try to submit new tasks to executor but executor started rejecting them. When RejectedExecutionException was detected current thread tried to executed scheduled tasks on its own. Because tasks may result in creation of new tasks it sometimes happened that Lockable read lock have been acquired in one task at the beginning of the rejected tasks execution chain and later in another task on an attempt to acquire write lock thread started to wait forever on read lock release. But because current thread acquired that read lock such wait was on forever. This resulted in container freeze.
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