net: ipv6: Do not keep linklocal and loopback addresses

net: ipv6: Do not keep linklocal and loopback addresses

7b33ab675396 added the option to retain user configured addresses on an
admin down. A comment to one of the later revisions suggested using the
IFA_F_PERMANENT flag rather than adding a user_managed boolean to the
ifaddr struct. A side effect of this change is that link local and
loopback addresses are also retained which is not part of the objective
of 7b33ab675396. Add check to drop those addresses.

Fixes: 7b33ab675396 ("net: ipv6: Make address flushing on ifdown optional")
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>