BAEL-10179 Fix start of Boot project with parent-boot-1 parent

-Added start-class placeholder in parent-boot-1
-Minor cleanup of few parent-boot-1 projects

persistence-modules/spring-data-dynamodb/pom.xml

@@ -1,9 +1,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
     <artifactId>spring-data-dynamodb</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
     <packaging>jar</packaging>
     <name>spring-data-dynamodb</name>
     <description>This is simple boot application for Spring boot dynamodb test</description>
@@ -85,8 +83,7 @@
         <dependency>
             <groupId>org.apache.httpcomponents</groupId>
             <artifactId>httpclient</artifactId>
-            <version>${httpclient.version}</version>
-        </dependency>
+            </dependency>
         <!-- ================================================== -->
         <!-- DynamoDBLocal dependencies -->
         <!-- ================================================== -->