Add instrumentation for Tomcat webapp classloading #741
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This is really the same thing we already do for OSGi and jboss.
The problem is that tomcat (and other app servers) have classloaders that do not delegate to parent.
This causes problems,
for example in case of tomcat things like
GlobalTracer
were loaded twice: ones by bootstrap and once by app loader. This resulted in having to separateGlobalTracers
in place where it should have been just one.