rcu: handle forks safely

After forking, only the calling thread is duplicated in the child process.
The call_rcu thread has to be recreated in the child.  Exploit the fact
that only one thread exists (same as when constructors run), and just redo
the entire initialization to ensure the threads are in the proper state.

The only additional things to do are emptying the list of threads
registered with RCU, and unlocking the lock that was taken in the prepare
callback (implementations are allowed to fail pthread_mutex_init()
if the mutex is still locked).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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