Exclude old version of Google API client libraries

Our com.google.apis:google-api-services-datastore-protobuf dependency
has a transitive dependency on a very old Google API client library.
This change suppresses that dependency and replaces it by depending
on a version that matches our other API dependencies.

sdk/pom.xml

@@ -544,6 +544,28 @@
       </exclusions>
     </dependency>
 
+    <!-- Required by com.google.apis:google-api-services-datastore-protobuf,
+         but the version they depend on differs from our api-client versions -->
+    <dependency>
+      <groupId>com.google.http-client</groupId>
+      <artifactId>google-http-client-jackson</artifactId>
+      <version>${google-clients.version}</version>
+      <exclusions>
+        <!-- Exclude an old version of guava that is being pulled
+             in by a transitive dependency of google-api-client -->
+        <exclusion>
+          <groupId>com.google.guava</groupId>
+          <artifactId>guava-jdk5</artifactId>
+        </exclusion>
+        <!--  Exclude an old version of jackson-core-asl -->
+        <exclusion>
+           <groupId>org.codehaus.jackson</groupId>
+           <artifactId>jackson-core-asl</artifactId>
+        </exclusion>
+      </exclusions>
+      <scope>runtime</scope>
+    </dependency>
+
     <dependency>
       <groupId>com.google.http-client</groupId>
       <artifactId>google-http-client-jackson2</artifactId>
@@ -558,6 +580,21 @@
       </exclusions>
     </dependency>
 
+    <dependency>
+      <groupId>com.google.http-client</groupId>
+      <artifactId>google-http-client-protobuf</artifactId>
+      <version>${google-clients.version}</version>
+      <exclusions>
+        <!-- Exclude an old version of guava that is being pulled
+             in by a transitive dependency of google-api-client -->
+        <exclusion>
+          <groupId>com.google.guava</groupId>
+          <artifactId>guava-jdk5</artifactId>
+        </exclusion>
+      </exclusions>
+      <scope>runtime</scope>
+    </dependency>
+
     <dependency>
       <groupId>com.google.oauth-client</groupId>
       <artifactId>google-oauth-client-java6</artifactId>
@@ -597,6 +634,27 @@
           <groupId>com.google.guava</groupId>
           <artifactId>guava-jdk5</artifactId>
         </exclusion>
+        <!-- Exclude old version of api client dependencies. -->
+        <exclusion>
+          <groupId>com.google.http-client</groupId>
+          <artifactId>google-http-client</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>com.google.api-client</groupId>
+          <artifactId>google-api-client</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>com.google.oauth-client</groupId>
+          <artifactId>google-oauth-client</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>com.google.http-client</groupId>
+          <artifactId>google-http-client-jackson</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>com.google.http-client</groupId>
+          <artifactId>google-http-client-protobuf</artifactId>
+        </exclusion>
       </exclusions>
     </dependency>