Update admin framework and dsconfig to support tagging
of component definitions as advanced and customizable:

* advanced components: these will not be displayed by
  default in dsconfig. Examples include the various
  system backends

* customizable components: these components are tagged
  as intended for customization using the CLI XML
  profile. Customizable components are usually the top
  level components previously referred to as "generic"
  by dsconfig. This term confused users who would, for
  example, mistake a "generic" backend for a JE backend.

This change is part of issue 1829.