Exclude all hadoop transitive dependencies

Hadoop pulls in a lot of transitive dependencies that we don't need. It also means we might accidentally depend on them without realising it. We only need the hadoop jars themselves to compile against anyway.

pom.xml

@@ -96,25 +96,56 @@
       <version>4.5.14</version>
     </dependency>
 
+    <dependency>
+      <groupId>commons-httpclient</groupId>
+      <artifactId>commons-httpclient</artifactId>
+      <version>3.1</version>
+      <optional>true</optional>
+    </dependency>
+
+    <dependency>
+      <groupId>commons-cli</groupId>
+      <artifactId>commons-cli</artifactId>
+      <version>1.9.0</version>
+    </dependency>
+
     <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-common</artifactId>
       <version>3.4.0</version>
       <optional>true</optional>
+      <exclusions>
+        <exclusion>
+          <groupId>*</groupId>
+          <artifactId>*</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
 
     <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-mapreduce-client-core</artifactId>
       <version>3.4.0</version>
       <optional>true</optional>
+      <exclusions>
+        <exclusion>
+          <groupId>*</groupId>
+          <artifactId>*</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
 
     <dependency>
       <groupId>org.apache.pig</groupId>
       <artifactId>pig</artifactId>
       <version>0.17.0</version>
       <scope>provided</scope>
+      <exclusions>
+        <exclusion>
+          <groupId>*</groupId>
+          <artifactId>*</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
 
     <dependency>