Intercepting USR1 in a module

[Andrew Punch]

Hi,

I created a dummy log file to test using the flush handler. This was
successful. I will now integrate it with our code.

An alternative (but more complex) method I thought of was to assign an
unused signal, use signalfd() to get a file descriptor then use
ngx_add_event() to add a handler to the main event queue. When this handler
was triggered it could set ngx_reopen=1

Your solution is faster to code up, so I will go with that. Thanks for the
help!

-Andrew

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