Fix bnd-maven-plugin configuration merging

Previously the configuration from the parent (per execution id) was
overriding the local config (per plugin). Now the parent configuration
is no longer per execution id, i.e. both local plugin configurations
(i.e. on plugin level and on execution id level) take precedence.

This closes #3471

pom.xml

@@ -219,14 +219,8 @@
                     <groupId>biz.aQute.bnd</groupId>
                     <artifactId>bnd-maven-plugin</artifactId>
                     <version>${bnd.version}</version>
-                    <executions>
-                        <execution>
-                            <id>bnd-process</id>
-                            <goals>
-                                <goal>bnd-process</goal>
-                            </goals>
-                            <configuration>
-                                <bnd><![CDATA[
+                    <configuration>
+                        <bnd><![CDATA[
 # a lot of bundle header are generated from pom elements by default: https://github.com/bndtools/bnd/tree/master/maven/bnd-maven-plugin#default-bundle-headers
 Bundle-Category: acs-aem-commons
 # export all versioned packages except for conditional ones (https://github.com/bndtools/bnd/issues/3721#issuecomment-579026778)
@@ -248,8 +242,14 @@ Bundle-DocURL: https://adobe-consulting-services.github.io/acs-aem-commons/
 # support only DS 1.4 (https://github.com/bndtools/bnd/pull/3121/files)
 -dsannotations-options: version;maximum=1.4.0,inherit
 -metatypeannotations-options: version;maximum=1.4.0
-                                ]]></bnd>
-                            </configuration>
+                        ]]></bnd>
+                    </configuration>
+                    <executions>
+                        <execution>
+                            <id>bnd-process</id>
+                            <goals>
+                                <goal>bnd-process</goal>
+                            </goals>
                         </execution>
                     </executions>
                     <dependencies>