Bael 6729 (#4389)

* Added parent module on poms that have no parent defined

* Removed dependency reduced pom from undertow module

* Added README

* [BAEL-6729] - Spring modules needs a spring parent

* [BAEL-6729] - Spring modules needs a spring parent

parent-spring-5/README.md

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+## Relevant articles:

parent-spring-5/pom.xml

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+<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>parent-spring-5</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <packaging>pom</packaging>
+    <name>parent-spring-5</name>
+    <description>Parent for all spring 5 core modules</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-core</artifactId>
+            <version>${spring.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>${junit.jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <spring.version>5.0.6.RELEASE</spring.version>
+        <junit.jupiter.version>5.0.2</junit.jupiter.version>
+    </properties>
+
+</project>