use ServiceLoader.load with the current classloader instead of the context classloader

[jonenst]

The context classloader can be the wrong one (and ServiceLoader.load returns an empty list)
when you are calling ServiceLoader.load in the ForkJoinPool.commonPool() (or any other thread pool)
and you have your classes in another classloader than the AppClassLoader (=system classloader).
This is the case when using a springboot fat jar, or when deploying the code in a war in an application
server, or when using mvn exec:java

Signed-off-by: Jon Harper jon.harper87@gmail.com

Please check if the PR fulfills these requirements (please use '[x]' to check the checkboxes, or submit the PR and then click the checkboxes)

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem ? If so, link to this issue using '#XXX' and skip the rest
NO

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
Bug Fix

What is the current behavior? (You can also link to an open issue here)
Run an importer (or any other computation that calls ServiceLoader.load()) in the forkjoinpool.commonpool in a war (or in maven exec:java) (or in a springboot fatjar), service loader returns an empty list

What is the new behavior (if this is a feature change)?
works

Does this PR introduce a breaking change or deprecate an API? If yes, check the following:
NO

Other information:

WIP: need to check if we want to use the thread context classloader as a fallback ? Something like

ServiceLoader serviceloader = ServiceLoader.load(X.Class, Y.class.getClassLoader())
if (Y.class.getClassLoader != Thread.getContextClassLoader && !serviceLoader.iterator().hasNext()) {
    ServiceLoader serviceloader = ServiceLoader.load(X.Class) // here it's using Thread.getContextClassLoader()
}

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