allow AsyncSignalHandler to attach and detach from an EventBase
Summary: Add attachEventBase() and detachEventBase() methods to AsyncSignalHandler, similar to the methods of AsyncSocket. The main benefit of this is that it allows creating an AsyncSignalHandler with an initially null EventBase, and then attaching it to an EventBase at some later point in time. Reviewed By: yfeldblum Differential Revision: D5315325 fbshipit-source-id: 8a4ca483a62ca86837ea0bb54fa9a70d59f2f04e
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