Distributed plug-in configuration templates

Distributed plug-in configuration templates

This change proposes a new handling of plugin configuration files:
- Each plugin is responsible to carry own configuration template files
- Each of the plugin build fragments are responsible to copy these configuration
  files to ..deploy/templates/plugins/.
- Later, some entity will be responsible to link rellevant configuration files
  from ..deploy/templates/plugins to ..<deploy_environment>/conf/plugins_conf,
  I.e. to respective/active deployment environment.
- The actual linking process is not in place yet, but it could for example be
  deploy.sh, a separate deploy prep script or similar performing the linking
  based on arguments, or a config file describing the wanted set-up.

Change-Id: Ia16a2c26bb1e1a51195be2382da502777d209a45
Signed-off-by: jonas.bjurel@ericsson.com <jonas.bjurel@ericsson.com>