Add /proc/keys to masked paths
Add /proc/keys to masked paths

This leaks information about keyrings on the host. Keyrings are
not namespaced.

Signed-off-by: Justin Cormack <af64ee19f04db9509cb02b0e470e11e5402ef9b3@docker.com>

kolyshkin/moby,nawawi/docker,konstruktoid/docker-upstream,gnailuy/docker,estesp/docker,tmp6154/docker,mahak/docker,trebonian/docker,trebonian/docker,konstruktoid/docker-1,yosifkit/docker,moby/moby,laijs/docker,jthelin/docker,jameszhan/docker,bearstech/moby,Mokolea/docker,jlhawn/docker,gnailuy/docker,YuPengZTE/docker,kojiromike/docker,scotttlin/docker,allencloud/docker,johnstep/moby-moby,laijs/moby,KarthikNayak/docker,thaJeztah/docker,pradipd/moby,konstruktoid/docker-upstream,unclejack/docker,KarthikNayak/docker,bearstech/moby,Ramzec/docker,mahak/docker,moul/docker,AkihiroSuda/docker,gnailuy/docker,paralin/docker,ibuildthecloud/docker,tonistiigi/docker,jvanz/docker,moul/docker,yongtang/docker,SvenDowideit/docker,estesp/docker,laijs/docker,vdemeester/docker,tonistiigi/docker,trebonian/docker,Ramzec/docker,flavio/docker,dccurtis/docker,moby/moby,flavio/docker,KarthikNayak/docker,johnstep/moby-moby,tonistiigi/docker,x1022as/docker,jthelin/docker,AkihiroSuda/docker,Ramzec/docker,Ramzec/docker,justincormack/docker,jwhonce/docker,kolyshkin/moby,laijs/moby,djs55/docker,ibuildthecloud/docker,dmcgowan/docker,thaJeztah/docker,dims/docker,nalind/docker,bearstech/moby,allencloud/docker,cpuguy83/docker,mikebrow/docker,mahak/docker,kolyshkin/docker,ibuildthecloud/docker,tophj-ibm/docker,johnstep/moby-moby,yosifkit/docker,mikebrow/docker,gnailuy/docker,paralin/docker,jvanz/docker,yosifkit/docker,crosbymichael/docker,unclejack/docker,allencloud/docker,YuPengZTE/docker,AkihiroSuda/docker,laijs/moby,dccurtis/docker,jwhonce/docker,thaJeztah/docker,nalind/docker,nalind/docker,moby/moby,SvenDowideit/docker,maxamillion/docker,rremer/moby,jvanz/docker,konstruktoid/docker-1,rancher/docker,estesp/docker,docker/docker,kojiromike/docker,dims/docker,flavio/docker,ibuildthecloud/docker,mahak/docker,jimjag/docker,cpuguy83/docker,maxamillion/docker,kolyshkin/moby,SvenDowideit/docker,thaJeztah/docker,pradipd/moby,duglin/docker,bearstech/moby,rremer/moby,yongtang/docker,djs55/docker,rancher/docker,tmp6154/docker,dmcgowan/docker,crosbymichael/docker,jimjag/docker,vdemeester/docker,jimjag/docker,konstruktoid/docker-upstream,cpuguy83/docker,rancher/docker,tophj-ibm/docker,pradipd/moby,docker/docker,tophj-ibm/moby,jlhawn/docker,nawawi/docker,yongtang/docker,YuPengZTE/docker,AkihiroSuda/docker,yosifkit/docker,jimjag/docker,noironetworks/docker,duglin/docker,tophj-ibm/moby,nawawi/docker,noironetworks/docker,maxamillion/docker,crosbymichael/docker,nawawi/docker,tophj-ibm/docker,cpuguy83/docker,laijs/docker,dims/docker,trebonian/docker,jameszhan/docker,moul/docker,djs55/docker,tmp6154/docker,kolyshkin/docker,rremer/moby,jwhonce/docker,scotttlin/docker,tophj-ibm/moby,dmcgowan/docker,moby/moby,dccurtis/docker,Mokolea/docker,duglin/docker,noironetworks/docker,justincormack/docker,nalind/docker,kojiromike/docker,jameszhan/docker,Mokolea/docker,vdemeester/docker,mikebrow/docker,unclejack/docker,jlhawn/docker,konstruktoid/docker-upstream,x1022as/docker,konstruktoid/docker-1,justincormack/docker,x1022as/docker,Mokolea/docker,docker/docker,ibuildthecloud/docker,flavio/docker,paralin/docker,moul/docker,scotttlin/docker,paralin/docker