FELIX-4286 remove unnecessary DelayedComponentManager class and improve some class names

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1532922 13f79535-47bb-0310-9956-ffa450edef68
update changelog for 1.8 release

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1532923 13f79535-47bb-0310-9956-ffa450edef68