Create pom.xml (#703)

1. hardcode maven version.
2. hard code appengine version
3. fix comment on mysql-connector

appengine-java8/cloudsql/pom.xml

@@ -40,7 +40,6 @@
     <database>sqldemo</database>
 
 <!-- [START_EXCLUDE] -->
-    <appengine.maven.plugin>1.3.1</appengine.maven.plugin>
     <maven.compiler.target>1.8</maven.compiler.target>
     <maven.compiler.source>1.8</maven.compiler.source>
 <!-- [END_EXCLUDE] -->
@@ -51,7 +50,7 @@
     <dependency>
       <groupId>com.google.appengine</groupId>
       <artifactId>appengine-api-1.0-sdk</artifactId>
-      <version>${appengine.sdk.version}</version>
+      <version>1.9.53</version>
     </dependency>
 
     <dependency>
@@ -72,7 +71,7 @@
     <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
-      <version>5.1.40</version>  <!-- v5.x.x is for production, v6.x.x EAP X DevAPI and Java 8 -->
+      <version>5.1.40</version>  <!-- v5.x.x is for production, v6.x.x EAP X DevAPI -->
       <!--<version>6.0.6</version>-->
     </dependency>
     <dependency>
@@ -105,7 +104,7 @@
       <plugin>
         <groupId>com.google.cloud.tools</groupId>
         <artifactId>appengine-maven-plugin</artifactId>
-        <version>${appengine.maven.plugin}</version>
+        <version>1.3.1</version>
         <configuration>
           <deploy.promote>true</deploy.promote>
           <deploy.stopPreviousVersion>true</deploy.stopPreviousVersion>