Adding back sfclisp to features index.

Adding back sfclisp to features index.

Sfclisp was removed in this change:
https://git.opendaylight.org/gerrit/#/c/17864/
to unblock distribution jobs.

Since then, SFC project has merged
https://git.opendaylight.org/gerrit/#/c/17725/
and there were many merges to other projects
which might have fixed sfclisp issues.

This patch tries to add sfclisp back to Integration
to see whether distribution-verify job succeeds.

Change-Id: I261dcd489675f64b3f140c95eeea5d5b4815e4f3
Signed-off-by: Vratko Polak <vrpolak@cisco.com>