Upgrade to Netty 4.1.25.Final

This commit upgrades us to Netty 4.1.25. This upgrade is more
challenging than past upgrades, all because of a new object cleaner
thread that they have added. This thread requires an additional security
permission (set context class loader, needed to avoid leaks in certain
scenarios). Additionally, there is not a clean way to shutdown this
thread which means that the thread can fail thread leak control during
tests. As such, we have to filter this thread from thread leak control.

Author: jasontedor

modules/transport-netty4/build.gradle

@@ -34,13 +34,13 @@ compileTestJava.options.compilerArgs << "-Xlint:-cast,-deprecation,-rawtypes,-tr
 
 dependencies {
     // network stack
-    compile "io.netty:netty-buffer:4.1.16.Final"
-    compile "io.netty:netty-codec:4.1.16.Final"
-    compile "io.netty:netty-codec-http:4.1.16.Final"
-    compile "io.netty:netty-common:4.1.16.Final"
-    compile "io.netty:netty-handler:4.1.16.Final"
-    compile "io.netty:netty-resolver:4.1.16.Final"
-    compile "io.netty:netty-transport:4.1.16.Final"
+    compile "io.netty:netty-buffer:4.1.25.Final"
+    compile "io.netty:netty-codec:4.1.25.Final"
+    compile "io.netty:netty-codec-http:4.1.25.Final"
+    compile "io.netty:netty-common:4.1.25.Final"
+    compile "io.netty:netty-handler:4.1.25.Final"
+    compile "io.netty:netty-resolver:4.1.25.Final"
+    compile "io.netty:netty-transport:4.1.25.Final"
 }
 
 dependencyLicenses {
@@ -161,6 +161,6 @@ thirdPartyAudit.excludes = [
 
         'org.conscrypt.AllocatedBuffer',
         'org.conscrypt.BufferAllocator',
-        'org.conscrypt.Conscrypt$Engines',
+        'org.conscrypt.Conscrypt',
         'org.conscrypt.HandshakeListener'
 ]

modules/transport-netty4/licenses/netty-buffer-4.1.16.Final.jar.sha1

@@ -0,0 +1 @@
+f366d0cc87b158ca064d27507127e3cc4eb2f089

modules/transport-netty4/licenses/netty-buffer-4.1.25.Final.jar.sha1

@@ -0,0 +1 @@
+3e465c75bead40d06b5b9c0612b37cf77c548887

modules/transport-netty4/licenses/netty-codec-4.1.16.Final.jar.sha1

@@ -0,0 +1 @@
+70888d3f2a829541378f68503ddd52c3193df35a

modules/transport-netty4/licenses/netty-codec-4.1.25.Final.jar.sha1

@@ -0,0 +1 @@
+e17d5c05c101fe14536ce3fb34b36c54e04791f6