Update opentracing api

[caiquecastanho]

I'd like to update the open tracing api's version to 0.33.0 in order to use opentracing-contrib/java-apache-httpclient.

I've took a look at the code to find out what I should update and I've found these ones:

• pom.xml

-        <opentracing.version>0.31.0</opentracing.version>
+        <opentracing.version>0.33.0</opentracing.version>
         <opentracing-concurrent.version>0.2.0</opentracing-concurrent.version>
-        <jaeger.version>0.33.1</jaeger.version>
+        <jaeger.version>1.3.2</jaeger.version>

• com.kumuluz.ee.opentracing.filters.OpenTracingServerRequestFilter

             requestContext.setProperty(CommonUtil.OPENTRACING_SPAN_TITLE,
spanBuilder.startActive(true).span());

• core/src/main/java/com/kumuluz/ee/opentracing/interceptors/TracedInterceptor.java

try (Scope scope = tracer.buildSpan(operationName).asChildOf(parentSpan).startActive(true))

According to the opentracing documentation: ScopeManager.active(Span, boolean) and SpanBuilder.startActive() have been deprecated as part of removing automatic Span finish upon Scope close...

Is there any more code I need to update?