Fix project and scm urls in child project POMs

Maven's default behaviour is to append path and artifact id to parent
 project url for setting child project's url. But this is not helpful
 because these urls, for instance https://github.com/quarkusio/quarkus/bom/quarkus-bom
 end up in 404s. Similarly, the scm urls are broken. The right behaviour
 would most likely be to point to just https://github.com/quarkusio/quarkus/.

Thankfully, Maven 3.6.1 introduced some attribute to set the child
 project's url to the project url of the parent without modifications.
Therefore, set the child.project.url.inherit.append.path project attribute
and various scm attributes to ensure the correct urls are generated.

pom.xml

@@ -1,7 +1,8 @@
 <?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">
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
+         child.project.url.inherit.append.path="false">
     <modelVersion>4.0.0</modelVersion>
     <parent>
         <groupId>org.jboss</groupId>
@@ -35,7 +36,9 @@
         </license>
     </licenses>
 
-    <scm>
+    <scm child.scm.connection.inherit.append.path="false"
+         child.scm.developerConnection.inherit.append.path="false"
+         child.scm.url.inherit.append.path="false">
         <url>https://github.com/quarkusio/quarkus</url>
         <connection>scm:git:[email protected]:quarkusio/quarkus.git</connection>
         <developerConnection>scm:git:[email protected]:quarkusio/quarkus.git</developerConnection>