libnetwork: ServeDNS(): don't panic on unsupported query types
libnetwork: ServeDNS(): don't panic on unsupported query types

This was added in b3c883bb2f560fc935315102983092438f76be25, but resulted
in a panic if the embedded DNS had to handle an unsupported query-type,
such as ANY.

This patch adds a debug log for this case (to better describe how it's
handled.

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

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