Remove local OSGi distribution.

Karaf distribution is still provided locally.

  * Add new feature, odl-vtn-manager-runtime, which installs requisites
    for VTN Manager. It is installed with odl-vtn-manager-all.
  * Change artifact ID to distribution.vtn-manager.karaf.

Change-Id: I5a386d4fdfe71051db4815a566a982b626fcbf99
Signed-off-by: Shigeru Yasuda <s-yasuda@da.jp.nec.com>