Remove unnecessary getVersion overrides (#1004)

instrumentation-core/servlet/src/main/java/io/opentelemetry/instrumentation/servlet/ServletHttpServerTracer.java

@@ -30,11 +30,6 @@ import javax.servlet.http.HttpServletRequest;
 public abstract class ServletHttpServerTracer<RESPONSE>
     extends HttpServerTracer<HttpServletRequest, RESPONSE, HttpServletRequest, HttpServletRequest> {
 
-  @Override
-  protected String getVersion() {
-    return null;
-  }
-
   @Override
   // TODO this violates convention
   protected URI url(HttpServletRequest httpServletRequest) throws URISyntaxException {

instrumentation-core/spring/spring-webmvc-3.1/src/main/java/io/opentelemetry/instrumentation/spring/webmvc/SpringWebMvcServerTracer.java

@@ -89,9 +89,4 @@ class SpringWebMvcServerTracer
   protected String getInstrumentationName() {
     return null;
   }
-
-  @Override
-  protected String getVersion() {
-    return null;
-  }
 }

instrumentation/akka-http-10.0/src/main/java/io/opentelemetry/instrumentation/auto/akkahttp/AkkaHttpServerTracer.java

@@ -77,11 +77,6 @@ public class AkkaHttpServerTracer
     return "io.opentelemetry.auto.akka-http-10.0";
   }
 
-  @Override
-  protected String getVersion() {
-    return null;
-  }
-
   @Override
   protected Integer peerPort(HttpRequest httpRequest) {
     return null;

instrumentation/armeria-1.0/library/src/main/java/io/opentelemetry/instrumentation/armeria/v1_0/server/ArmeriaServerTracer.java

@@ -46,11 +46,6 @@ public class ArmeriaServerTracer
     return "io.opentelemetry.armeria-1.0";
   }
 
-  @Override
-  protected String getVersion() {
-    return null;
-  }
-
   @Override
   protected Integer peerPort(ServiceRequestContext ctx) {
     SocketAddress socketAddress = ctx.remoteAddress();

instrumentation/grizzly-2.0/src/main/java/io/opentelemetry/instrumentation/auto/grizzly/GrizzlyHttpServerTracer.java

@@ -88,11 +88,6 @@ public class GrizzlyHttpServerTracer
     return "io.opentelemetry.auto.grizzly-2.0";
   }
 
-  @Override
-  protected String getVersion() {
-    return null;
-  }
-
   @Override
   protected Integer peerPort(HttpRequestPacket httpRequest) {
     return httpRequest.getRemotePort();

instrumentation/netty/netty-3.8/src/main/java/io/opentelemetry/instrumentation/auto/netty/v3_8/server/NettyHttpServerTracer.java

@@ -93,11 +93,6 @@ public class NettyHttpServerTracer
     return "io.opentelemetry.auto.netty-3.8";
   }
 
-  @Override
-  protected String getVersion() {
-    return null;
-  }
-
   @Override
   protected Integer peerPort(Channel channel) {
     SocketAddress socketAddress = channel.getRemoteAddress();

instrumentation/netty/netty-4.0/src/main/java/io/opentelemetry/instrumentation/auto/netty/v4_0/server/NettyHttpServerTracer.java

@@ -64,11 +64,6 @@ public class NettyHttpServerTracer
     return "io.opentelemetry.auto.netty-4.0";
   }
 
-  @Override
-  protected String getVersion() {
-    return null;
-  }
-
   @Override
   protected Getter<HttpRequest> getGetter() {
     return NettyRequestExtractAdapter.GETTER;

instrumentation/netty/netty-4.1/src/main/java/io/opentelemetry/instrumentation/auto/netty/v4_1/server/NettyHttpServerTracer.java

@@ -64,11 +64,6 @@ public class NettyHttpServerTracer
     return "io.opentelemetry.auto.netty-4.1";
   }
 
-  @Override
-  protected String getVersion() {
-    return null;
-  }
-
   @Override
   protected Getter<HttpRequest> getGetter() {
     return NettyRequestExtractAdapter.GETTER;