SPARK-2879 part 2 [BUILD] Use HTTPS to access Maven Central and other repos

.. and use canonical repo1.maven.org Maven Central repo. (And make sure snapshots are disabled for plugins from Maven Central.)

Author: Sean Owen <srowen@gmail.com>

Closes #1828 from srowen/SPARK-2879.2 and squashes the following commits:

639f495 [Sean Owen] .. and use canonical repo1.maven.org Maven Central repo. (And make sure snapshots are disabled for plugins from Maven Central.)
(cherry picked from commit 75993a6)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>

Author: srowen

pom.xml

@@ -145,8 +145,7 @@
       <id>central</id>
       <!-- This should be at top, it makes maven try the central repo first and then others and hence faster dep resolution -->
       <name>Maven Repository</name>
-      <!-- HTTPS is unavailable for Maven Central -->
-      <url>https://repo.maven.apache.org/maven2</url>
+      <url>https://repo1.maven.org/maven2</url>
       <releases>
         <enabled>true</enabled>
       </releases>
@@ -228,6 +227,9 @@
       <releases>
         <enabled>true</enabled>
       </releases>
+      <snapshots>
+        <enabled>false</enabled>
+      </snapshots>
     </pluginRepository>
   </pluginRepositories>