ice: filter local deprecated and tentative ipv6 addresses

As described in RFC 2462, an ipv6 address can have several states and
some should be ignored when initializing an ICE session:

In fact DEPRECATED address SHOULD NOT be used in new communications.
Also, a TENTATIVE address is not ready to be used too. So, this
patch ignores this kind of addresses when initializing a new connection.

Change-Id: I95637286eb68451352fd7289a49ddc3cdf5ac383
Gitlab: #29
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>