SPARK-1802. (Addendium) Audit dependency graph when Spark is built with -Pyarn

Following on a few more items from SPARK-1802 --

The first commit touches up a few similar problems remaining with the YARN profile. I think this is worth cherry-picking.

The second commit is more of the same for hadoop-client, although the fix is a little more complex. It may or may not be worth bothering with.

Author: Sean Owen <sowen@cloudera.com>

Closes #746 from srowen/SPARK-1802.2 and squashes the following commits:

52aeb41 [Sean Owen] Add more commons-logging, servlet excludes to avoid conflicts in assembly when building for YARN

pom.xml

@@ -583,6 +583,10 @@
             <groupId>org.jboss.netty</groupId>
             <artifactId>netty</artifactId>
           </exclusion>
+          <exclusion>
+            <groupId>commons-logging</groupId>
+            <artifactId>commons-logging</artifactId>
+          </exclusion>
         </exclusions>
       </dependency>
       <dependency>
@@ -606,6 +610,10 @@
             <groupId>javax.servlet</groupId>
             <artifactId>servlet-api</artifactId>
           </exclusion>
+          <exclusion>
+            <groupId>commons-logging</groupId>
+            <artifactId>commons-logging</artifactId>
+          </exclusion>
         </exclusions>
       </dependency>
       <dependency>
@@ -625,6 +633,14 @@
             <groupId>org.jboss.netty</groupId>
             <artifactId>netty</artifactId>
           </exclusion>
+          <exclusion>
+            <groupId>javax.servlet</groupId>
+            <artifactId>servlet-api</artifactId>
+          </exclusion>
+          <exclusion>
+            <groupId>commons-logging</groupId>
+            <artifactId>commons-logging</artifactId>
+          </exclusion>
         </exclusions>
       </dependency>
       <dependency>
@@ -648,6 +664,10 @@
             <groupId>javax.servlet</groupId>
             <artifactId>servlet-api</artifactId>
           </exclusion>
+          <exclusion>
+            <groupId>commons-logging</groupId>
+            <artifactId>commons-logging</artifactId>
+          </exclusion>
         </exclusions>
       </dependency>
       <dependency>