Allow multiplexing channel selector to specify optional channels.
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                 Key: FLUME-946
                 URL: https://issues.apache.org/jira/browse/FLUME-946
             Project: Flume
          Issue Type: Improvement
            Reporter: Arvind Prabhakar


Right now the multiplexing channel selector treats all channels as required 
channels. There should be a simple provision where some channel can be marked 
optional so that a failure in publishing the event to that particular channel 
does not cause the entire request to fail. For example, the following 
configuration:

agent.sources.foo.selector.mapping.foo = ch1 ch2
agent.sources.foo.selector.mapping.bar = ch2 ch3
agent.sources.foo.selector.optional.channels = ch2

Would imply that for mapping value "foo", ch1 is a required channel whereas ch2 
is an optional channel. Similarly, for mapping "bar', ch3 is a required channel 
but ch2 is optional.

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