Remove most shadow relocates

Shadow relocates are no longer needed because of our new bootstrapping
process.
It's no longer possible for agent dependencies to interfere with the
user's classpath.

The immediate reason for this change is a bug created in the Cassandra
instrumentation.
The Cassandra instrumentation references guava transitive deps from
the datastax driver. These references are re-written by shadow,
causing the instrumentation to reference 'datadog.agent.deps.google.*'
instead of the guava class.

dd-java-agent-ittests/src/test/groovy/datadog/trace/agent/integration/classloading/ShadowPackageRenamingTest.groovy

@@ -19,7 +19,7 @@ class ShadowPackageRenamingTest extends Specification {
     final String agentGuavaDep =
       ddClass
         .getClassLoader()
-        .loadClass("datadog.trace.agent.deps.google.common.collect.MapMaker")
+        .loadClass("com.google.common.collect.MapMaker")
         .getProtectionDomain()
         .getCodeSource()
         .getLocation()
@@ -99,7 +99,6 @@ class ShadowPackageRenamingTest extends Specification {
    expect:
    duplicateClassFile == []
    badBootstrapPrefixes == []
-    // ListenableFuture is skipped from shadow due to cassandra instrumentation.
-   badAgentPrefixes == ['com.google.common.util.concurrent.ListenableFuture']
+   badAgentPrefixes == []
   }
 }

dd-java-agent/agent-tooling/src/main/java/datadog/trace/agent/tooling/Utils.java

@@ -16,10 +16,21 @@ public class Utils {
     "datadog.trace.context"
   };
   public static final String[] AGENT_PACKAGE_PREFIXES = {
-    "datadog.trace.agent",
-    "datadog.opentracing",
     "datadog.trace.common",
-    "datadog.trace.instrumentation"
+    "datadog.trace.agent",
+    "datadog.trace.instrumentation",
+    // guava
+    "com.google.auto",
+    "com.google.common",
+    "com.google.thirdparty.publicsuffix",
+    // bytebuddy
+    "net.bytebuddy",
+    // OT contribs for dd trace resolver
+    "io.opentracing.contrib",
+    // jackson
+    "org.msgpack",
+    "com.fasterxml.jackson",
+    "org.yaml.snakeyaml"
   };
 
   private static Method findLoadedClassMethod = null;

dd-java-agent/dd-java-agent.gradle

@@ -41,23 +41,9 @@ def includeShadowJar(subproject, jarname) {
       relocate 'java.util.logging.Logger', 'datadog.trace.bootstrap.PatchLogger'
 
       if (!project.hasProperty("disableShadowRelocate") || !disableShadowRelocate) {
+        // shadow OT impl to prevent casts to implementation
         relocate 'datadog.trace.common', 'datadog.trace.agent.common'
         relocate 'datadog.opentracing', 'datadog.trace.agent.ot'
-
-        relocate('io.opentracing.contrib', 'datadog.trace.agent.opentracing.contrib') {
-          // Don't want to change the annotation we're looking for.
-          exclude 'io.opentracing.contrib.dropwizard.Trace'
-        }
-
-        relocate 'org.yaml', 'datadog.trace.agent.deps.yaml'
-        relocate 'org.msgpack', 'datadog.trace.agent.deps.msgpack'
-        relocate 'com.fasterxml', 'datadog.trace.agent.deps.fasterxml'
-
-        relocate 'net.bytebuddy', 'datadog.trace.agent.deps.bytebuddy'
-        relocate('com.google', 'datadog.trace.agent.deps.google') {
-          // This is used in the Cassandra Cluster.connectAsync signature so we can't relocate it. :fingers_crossed:
-          exclude 'com.google.common.util.concurrent.ListenableFuture'
-        }
       }
     }
   }