ServiceHelper - Avoid started/stopping service if already started/stopped
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                 Key: CAMEL-3600
                 URL: https://issues.apache.org/jira/browse/CAMEL-3600
             Project: Camel
          Issue Type: Improvement
          Components: camel-core
    Affects Versions: 2.5.0
            Reporter: Claus Ibsen
            Assignee: Claus Ibsen
             Fix For: 2.7.0


We should optimize ServiceHelper to detect if the service is already 
started/stopped (if it extends ServiceSupport, as then it provides state).
Also DefaultEndpoint should extends ServiceSupport to provide state so we know 
if the endpoint is started/stopped.

This avoid double starting or stopping services which is not needed.
And some custom components may not work well if they are started twice, just 
because Camel handles it lifecycle and invokes start multiple times.

Also refine the logging in ServiceHelper from TRACE to DEBUG level so its 
easier to spot the lifecycle.

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