remove extra space in code comment in ping.go
remove extra space in code comment in ping.go

Signed-off-by: Daniel Helfand <b7ec8363fa00a8d8291fa455a46cf800484e7920@gmail.com>

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