This bug did not make the OSP 8.0 release. It is being deferred to OSP 10.
default on compute is :
[root@compute-0 ~]# cat /proc/sys/net/ipv6/conf/default/accept_ra
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.