[SPARK-7302] [DOCS] SPARK building documentation still mentions building for yarn 0.23

Remove references to Hadoop 0.23

CC tgravescs Is this what you had in mind? basically all refs to 0.23?
We don't support YARN 0.23, but also don't support Hadoop 0.23 anymore AFAICT. There are no builds or releases for it.

In fact, on a related note, refs to CDH3 (Hadoop 0.20.2) should be removed as this certainly isn't supported either.

Author: Sean Owen <sowen@cloudera.com>

Closes #5863 from srowen/SPARK-7302 and squashes the following commits:

42f5d1e [Sean Owen] Remove CDH3 (Hadoop 0.20.2) refs too
dad02e3 [Sean Owen] Remove references to Hadoop 0.23

docs/building-spark.md

@@ -66,7 +66,6 @@ Because HDFS is not protocol-compatible across versions, if you want to read fro
     <tr><th>Hadoop version</th><th>Profile required</th></tr>
   </thead>
   <tbody>
-    <tr><td>0.23.x</td><td>hadoop-0.23</td></tr>
     <tr><td>1.x to 2.1.x</td><td>(none)</td></tr>
     <tr><td>2.2.x</td><td>hadoop-2.2</td></tr>
     <tr><td>2.3.x</td><td>hadoop-2.3</td></tr>
@@ -82,9 +81,6 @@ mvn -Dhadoop.version=1.2.1 -DskipTests clean package
 
 # Cloudera CDH 4.2.0 with MapReduce v1
 mvn -Dhadoop.version=2.0.0-mr1-cdh4.2.0 -DskipTests clean package
-
-# Apache Hadoop 0.23.x
-mvn -Phadoop-0.23 -Dhadoop.version=0.23.7 -DskipTests clean package
 {% endhighlight %}
 
 You can enable the "yarn" profile and optionally set the "yarn.version" property if it is different from "hadoop.version". Spark only supports YARN versions 2.2.0 and later.

docs/hadoop-third-party-distributions.md

@@ -29,9 +29,6 @@ the _exact_ Hadoop version you are running to avoid any compatibility errors.
         <tr><th>Release</th><th>Version code</th></tr>
         <tr><td>CDH 4.X.X (YARN mode)</td><td>2.0.0-cdh4.X.X</td></tr>
         <tr><td>CDH 4.X.X</td><td>2.0.0-mr1-cdh4.X.X</td></tr>
-        <tr><td>CDH 3u6</td><td>0.20.2-cdh3u6</td></tr>
-        <tr><td>CDH 3u5</td><td>0.20.2-cdh3u5</td></tr>
-        <tr><td>CDH 3u4</td><td>0.20.2-cdh3u4</td></tr>
       </table>
     </td>
     <td>

make-distribution.sh

@@ -58,7 +58,7 @@ while (( "$#" )); do
     --hadoop)
       echo "Error: '--hadoop' is no longer supported:"
       echo "Error: use Maven profiles and options -Dhadoop.version and -Dyarn.version instead."
-      echo "Error: Related profiles include hadoop-0.23, hdaoop-2.2, hadoop-2.3 and hadoop-2.4."
+      echo "Error: Related profiles include hadoop-2.2, hadoop-2.3 and hadoop-2.4."
       exit_with_usage
       ;;
     --with-yarn)

pom.xml

@@ -1614,20 +1614,6 @@
     http://hadoop.apache.org/docs/ra.b.c/hadoop-project-dist/hadoop-common/dependency-analysis.html
     -->
 
-    <profile>
-      <id>hadoop-0.23</id>
-      <!-- SPARK-1121: Adds an explicit dependency on Avro to work around a Hadoop 0.23.X issue -->
-      <dependencies>
-        <dependency>
-          <groupId>org.apache.avro</groupId>
-          <artifactId>avro</artifactId>
-        </dependency>
-      </dependencies>
-      <properties>
-        <hadoop.version>0.23.10</hadoop.version>
-      </properties>
-    </profile>
-
     <profile>
       <id>hadoop-2.2</id>
       <properties>