Check for BRIDGE_VLAN_FILTERING in overlay section
Check for BRIDGE_VLAN_FILTERING in overlay section

Overlay networking in docker stack does not work correctly if this option is missing, docker will output the following error:

```
enabling default vlan on bridge br0 failed open /sys/class/net/br0/bridge/default_pvdi: permission denied
```

This because `default_pvdi` does not exist without this option.

Signed-off-by: Pascal Bach <c1871a1ff3996cb06c2135f3bc3cd446fabdea06@siemens.com>
Signed-off-by: Simon Ausserlechner <6479b4085c7f6bc2687f0f0322f73e6907b67c3a@siemens.com>

konstruktoid/docker-upstream,ibuildthecloud/docker,estesp/docker,AkihiroSuda/docker,nawawi/docker,crosbymichael/docker,yosifkit/docker,jthelin/docker,jthelin/docker,moul/docker,konstruktoid/docker-1,tmp6154/docker,kojiromike/docker,konstruktoid/docker-1,AkihiroSuda/docker,pradipd/moby,thaJeztah/docker,nalind/docker,dims/docker,mahak/docker,yongtang/docker,crosbymichael/docker,SvenDowideit/docker,konstruktoid/docker-upstream,jimjag/docker,AkihiroSuda/docker,Ramzec/docker,kojiromike/docker,vdemeester/docker,jimjag/docker,moul/docker,paralin/docker,bearstech/moby,jameszhan/docker,thaJeztah/docker,justincormack/docker,kolyshkin/moby,jimjag/docker,djs55/docker,Mokolea/docker,konstruktoid/docker-1,SvenDowideit/docker,jameszhan/docker,moby/moby,Ramzec/docker,moby/moby,paralin/docker,jvanz/docker,trebonian/docker,bearstech/moby,cpuguy83/docker,ibuildthecloud/docker,trebonian/docker,tmp6154/docker,gnailuy/docker,trebonian/docker,nawawi/docker,estesp/docker,nalind/docker,pradipd/moby,AkihiroSuda/docker,konstruktoid/docker-upstream,paralin/docker,yongtang/docker,flavio/docker,mahak/docker,yongtang/docker,mahak/docker,jimjag/docker,thaJeztah/docker,unclejack/docker,docker/docker,kojiromike/docker,yosifkit/docker,yosifkit/docker,cpuguy83/docker,nawawi/docker,kolyshkin/moby,vdemeester/docker,Ramzec/docker,Mokolea/docker,ibuildthecloud/docker,gnailuy/docker,unclejack/docker,yosifkit/docker,jvanz/docker,konstruktoid/docker-upstream,tmp6154/docker,moby/moby,nalind/docker,docker/docker,gnailuy/docker,paralin/docker,Mokolea/docker,SvenDowideit/docker,nawawi/docker,unclejack/docker,flavio/docker,gnailuy/docker,dims/docker,jameszhan/docker,trebonian/docker,djs55/docker,mahak/docker,moul/docker,moul/docker,ibuildthecloud/docker,Ramzec/docker,ibuildthecloud/docker,bearstech/moby,kolyshkin/moby,Mokolea/docker,dims/docker,justincormack/docker,docker/docker,bearstech/moby,justincormack/docker,cpuguy83/docker,cpuguy83/docker,jvanz/docker,crosbymichael/docker,estesp/docker,vdemeester/docker,nalind/docker,flavio/docker,flavio/docker,thaJeztah/docker,djs55/docker,moby/moby,pradipd/moby