lock port mapper when reapply iptables rules
lock port mapper when reapply iptables rules

Make sure that port mapper state is not updated while we are trying to remap
everything.

Signed-off-by: Daniel Dao <4352fbbb12651c3d040c1aea4db0e66c7b1c24e0@cloudflare.com>

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