Comment out pom.xml sections related to deployment

A user reported this config doesn't work with Maven 3 for downloading
the extension necessary to define the Google Cloud Storage based Maven
repo. Rather than spend too much time debugging, just comment it out for
now; maintainers can uncomment on the rare occasions they need to
deploy.

Change-Id: Ibec9940b7774ec25e18cf910e1b61bd5e8560390

pom.xml

diff --git a/pom.xml b/pom.xml
index 3fe34e0..1114cd7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -170,11 +170,14 @@
     </pluginManagement>
 
     <extensions>
+      <!-- Uncomment to deploy with mvn:deploy. -->
+      <!--
       <extension>
         <groupId>com.googlesource.gerrit</groupId>
         <artifactId>gs-maven-wagon</artifactId>
         <version>3.3</version>
       </extension>
+      -->
     </extensions>
   </build>
 
@@ -196,6 +199,8 @@
     </repository>
   </repositories>
 
+  <!-- Uncomment to deploy with mvn:deploy. -->
+  <!--
   <distributionManagement>
     <repository>
       <id>gerrit-maven-repository</id>
@@ -203,4 +208,5 @@
       <uniqueVersion>true</uniqueVersion>
     </repository>
   </distributionManagement>
+  -->
 </project>