Do not build Karaf 3 features and distro

Do not build Karaf 3 features and distro

Disable building the Karaf 3 features and local distribution, since
that's a prerequisite for getting back into autorelease in Nitrogen [0],
apart from the build breaking right now.

For now, just comment them out in the build, we fully remove source code
just before code freeze (in case we need to contrast behaviors between a
Karaf 3 and 4 container).

[0] https://lists.opendaylight.org/pipermail/odlparent-dev/2017-June/001036.html

Change-Id: Id7f9a82e4b9868ad57141d3ef7e5a0cc2ef74946
Signed-off-by: Lorand Jakab <lojakab@cisco.com>