Remove parent pom from some JavaClasspathTest projects

That way it's clear what's tested as inheritance happens to override
things.

org.eclipse.m2e.tests/projects/549312-fallbackToLatestEE/pom.xml

@@ -1,11 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-  <parent>
-    <groupId>org.eclipse.m2e.test</groupId>
-    <artifactId>m2e-test-parent</artifactId>
-    <version>1.0.0</version>
-  </parent>
+  <groupId>org.eclipse.m2e.test</groupId>
   <artifactId>549312-fallbackToLatestEE</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <build>

org.eclipse.m2e.tests/projects/release-flag/pom-release.xml

@@ -2,12 +2,7 @@
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
-	<parent>
-		<groupId>org.eclipse.m2e.test</groupId>
-		<artifactId>m2e-test-parent</artifactId>
-		<version>1.0.0</version>
-	</parent>
-
+	<groupId>org.eclipse.m2e.test</groupId>
 	<artifactId>release-flag</artifactId>
 	<version>0.0.1-SNAPSHOT</version>
 	<build>

org.eclipse.m2e.tests/projects/release-flag/pom.xml

@@ -2,12 +2,7 @@
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 
-	<parent>
-		<groupId>org.eclipse.m2e.test</groupId>
-		<artifactId>m2e-test-parent</artifactId>
-		<version>1.0.0</version>
-	</parent>
-
+	<groupId>org.eclipse.m2e.test</groupId>
 	<artifactId>release-flag</artifactId>
 	<version>0.0.1-SNAPSHOT</version>
 	<build>