Back up maven-bundle-plugin to 3.5.1 since 4.0.0 and up require Java 8.

Author: Gary Gregory

pom.xml

@@ -250,6 +250,8 @@ file comparators, endian transformation classes, and much more.
   <properties>
     <maven.compiler.source>1.7</maven.compiler.source>
     <maven.compiler.target>1.7</maven.compiler.target>
+    <!--  version 4.0.0 requires Java 8 -->
+    <commons.felix.version>3.5.1</commons.felix.version>
     <commons.componentid>io</commons.componentid>
     <commons.module.name>org.apache.commons.io</commons.module.name>
     <commons.rc.version>RC1</commons.rc.version>