Allow reattempt of overlay network sbox join
Allow reattempt of overlay network sbox join

- if failure happened during restore endpoint phase

Signed-off-by: Alessandro Boch <5bd2eb5b6f60921d9a2b9cb6a0a86bb947f3d361@docker.com>

mYmNeo/libnetwork,medallia/libnetwork,kolyshkin/libnetwork,ityangchen/libnetwork,mbanikazemi/libnetwork,allencloud/libnetwork,mbanikazemi/libnetwork,mahak/libnetwork,kolyshkin/libnetwork,curtiszimmerman/libnetwork,medallia/libnetwork,docker/libnetwork,kolyshkin/libnetwork,WeiZhang555/libnetwork,fcrisciani/libnetwork,cpuguy83/libnetwork,allencloud/libnetwork,abhi/libnetwork,tmakita/libnetwork,msabansal/libnetwork,vdemeester/libnetwork,abhi/libnetwork,cpuguy83/libnetwork,sainath14/libnetwork,medallia/libnetwork,docker/libnetwork,vdemeester/libnetwork,WeiZhang555/libnetwork,msabansal/libnetwork,fcrisciani/libnetwork,mahak/libnetwork,sainath14/libnetwork,curtiszimmerman/libnetwork,abhi/libnetwork,tmakita/libnetwork,ityangchen/libnetwork,mYmNeo/libnetwork,docker/libnetwork,vdemeester/libnetwork,mahak/libnetwork