Upgrade and shade netty

Make driver depend on netty-handler instead of netty-all because it
is much smaller and contains only features we use. Also netty version
is upgraded from 4.1.15 to 4.1.16.

Introduced shade plugin to pack netty dependency inside driver jar.
Shaded classes will be relocated to `org.neo4j.driver.internal.shaded`
package. This means driver will not bring netty as it's transitive
dependency and has it's private copy of netty classes removing the
possibility of dependency conflicts.

.gitignore

@@ -25,3 +25,4 @@ community/neo4j-harness/data
 community/server-plugin-test/neo4j-home
 enterprise/server-enterprise/neo4j-home
 integrationtests/data
+dependency-reduced-pom.xml

driver/pom.xml

@@ -8,7 +8,7 @@
     <build.revision></build.revision>
     <bundle.name>${project.groupId}.${project.artifactId}</bundle.name>
     <maven.build.timestamp.format>'v'yyyyMMdd-HHmm</maven.build.timestamp.format>
-      <netty.version>4.1.15.Final</netty.version>
+    <netty.version>4.1.16.Final</netty.version>
   </properties>
 
   <parent>
@@ -35,7 +35,7 @@
   <dependencies>
       <dependency>
           <groupId>io.netty</groupId>
-          <artifactId>netty-all</artifactId>
+          <artifactId>netty-handler</artifactId>
           <version>${netty.version}</version>
       </dependency>
 
@@ -220,13 +220,22 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
-        <version>2.19.1</version>
+        <version>2.20.1</version>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-failsafe-plugin</artifactId>
-        <version>2.19</version>
+        <version>2.20.1</version>
         <configuration>
+          <!--
+          Failsafe plugin starting from 2.19 by default runs tests from 'target/test-classes' against a package jar.
+          When we shade things into the jar packages are changed, however tests in 'target/test-classes' do not.
+          This results in AbstractMethodError and other kind of strange errors.
+
+          Following setting tells failsafe to run tests against 'target/classes' instead.
+          See https://issues.apache.org/jira/browse/SUREFIRE-1198 for more details.
+          -->
+          <classesDirectory>${project.build.directory}/classes</classesDirectory>
         </configuration>
         <executions>
           <execution>
@@ -237,6 +246,32 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>3.1.0</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <artifactSet>
+                <includes>
+                  <include>io.netty:*</include>
+                </includes>
+              </artifactSet>
+              <relocations>
+                <relocation>
+                  <pattern>io.netty</pattern>
+                  <shadedPattern>org.neo4j.driver.internal.shaded.io.netty</shadedPattern>
+                </relocation>
+              </relocations>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>