networkdb: fix race in access to nodes len
networkdb: fix race in access to nodes len

Signed-off-by: Alexander Morozov <2043cda4df124b840b98ee1c4307c199042efdf7@gmail.com>

konstruktoid/docker-upstream,Mokolea/docker,jameszhan/docker,cpuguy83/docker,jimjag/docker,konstruktoid/docker-upstream,cpuguy83/docker,bearstech/moby,nawawi/docker,nawawi/docker,docker/docker,konstruktoid/docker-upstream,flavio/docker,Ramzec/docker,nalind/docker,paralin/docker,nalind/docker,flavio/docker,moby/moby,docker/docker,nalind/docker,paralin/docker,djs55/docker,moby/moby,mahak/docker,djs55/docker,jthelin/docker,jimjag/docker,Ramzec/docker,docker/docker,vdemeester/docker,jimjag/docker,moby/moby,cpuguy83/docker,trebonian/docker,nawawi/docker,vdemeester/docker,cpuguy83/docker,yosifkit/docker,gnailuy/docker,jameszhan/docker,AkihiroSuda/docker,moul/docker,thaJeztah/docker,paralin/docker,bearstech/moby,thaJeztah/docker,moul/docker,Mokolea/docker,yosifkit/docker,gnailuy/docker,jthelin/docker,mahak/docker,thaJeztah/docker,AkihiroSuda/docker,Ramzec/docker,nawawi/docker,djs55/docker,mahak/docker,bearstech/moby,bearstech/moby,nalind/docker,trebonian/docker,paralin/docker,yosifkit/docker,moby/moby,flavio/docker,konstruktoid/docker-upstream,thaJeztah/docker,jameszhan/docker,moul/docker,Mokolea/docker,Mokolea/docker,AkihiroSuda/docker,vdemeester/docker,AkihiroSuda/docker,jimjag/docker,trebonian/docker,mahak/docker,yosifkit/docker,moul/docker,gnailuy/docker,gnailuy/docker,Ramzec/docker,trebonian/docker,flavio/docker