vhost_user: Improve log messages
vhost_user: Improve log messages

Be more consistent about flagging messages as being from vhost_user
and referring to which connection they refer to.

eugeneia/snabb,xdel/snabbswitch,snabbnfv-goodies/snabbswitch,wingo/snabbswitch,lukego/snabb,pirate/snabbswitch,dpino/snabb,hb9cwp/snabbswitch,kellabyte/snabbswitch,eugeneia/snabb,dpino/snabbswitch,aperezdc/snabbswitch,heryii/snabb,wingo/snabb,Igalia/snabb,SnabbCo/snabbswitch,heryii/snabb,wingo/snabbswitch,kbara/snabb,kbara/snabb,xdel/snabbswitch,kbara/snabb,eugeneia/snabbswitch,Igalia/snabbswitch,alexandergall/snabbswitch,Igalia/snabbswitch,hb9cwp/snabbswitch,lukego/snabb,alexandergall/snabbswitch,javierguerragiraldez/snabbswitch,pavel-odintsov/snabbswitch,andywingo/snabbswitch,dwdm/snabbswitch,eugeneia/snabb,lukego/snabbswitch,aperezdc/snabbswitch,kbara/snabb,eugeneia/snabb,eugeneia/snabb,justincormack/snabbswitch,heryii/snabb,Igalia/snabb,Igalia/snabb,Igalia/snabb,eugeneia/snabb,Igalia/snabb,SnabbCo/snabbswitch,pavel-odintsov/snabbswitch,snabbnfv-goodies/snabbswitch,snabbco/snabb,alexandergall/snabbswitch,plajjan/snabbswitch,snabbco/snabb,justincormack/snabbswitch,pirate/snabbswitch,javierguerragiraldez/snabbswitch,plajjan/snabbswitch,pavel-odintsov/snabbswitch,SnabbCo/snabbswitch,dpino/snabb,virtualopensystems/snabbswitch,aperezdc/snabbswitch,mixflowtech/logsensor,lukego/snabbswitch,xdel/snabbswitch,kbara/snabb,alexandergall/snabbswitch,dwdm/snabbswitch,andywingo/snabbswitch,eugeneia/snabbswitch,dpino/snabb,Igalia/snabbswitch,wingo/snabb,Igalia/snabbswitch,Igalia/snabb,kbara/snabb,dpino/snabb,heryii/snabb,dpino/snabbswitch,fhanik/snabbswitch,dpino/snabbswitch,kellabyte/snabbswitch,virtualopensystems/snabbswitch,kellabyte/snabbswitch,lukego/snabb,pirate/snabbswitch,plajjan/snabbswitch,andywingo/snabbswitch,wingo/snabb,dwdm/snabbswitch,eugeneia/snabb,snabbco/snabb,javierguerragiraldez/snabbswitch,Igalia/snabbswitch,alexandergall/snabbswitch,andywingo/snabbswitch,SnabbCo/snabbswitch,dpino/snabb,mixflowtech/logsensor,snabbco/snabb,Igalia/snabb,mixflowtech/logsensor,aperezdc/snabbswitch,wingo/snabb,plajjan/snabbswitch,alexandergall/snabbswitch,lukego/snabb,justincormack/snabbswitch,snabbco/snabb,wingo/snabb,alexandergall/snabbswitch,heryii/snabb,lukego/snabbswitch,eugeneia/snabb,snabbco/snabb,hb9cwp/snabbswitch,snabbnfv-goodies/snabbswitch,virtualopensystems/snabbswitch,heryii/snabb,dpino/snabbswitch,dpino/snabb,snabbnfv-goodies/snabbswitch,justincormack/snabbswitch,eugeneia/snabbswitch,snabbco/snabb,snabbco/snabb,lukego/snabbswitch,fhanik/snabbswitch,fhanik/snabbswitch,eugeneia/snabbswitch,hb9cwp/snabbswitch,Igalia/snabb,wingo/snabbswitch,wingo/snabbswitch,mixflowtech/logsensor,wingo/snabb,alexandergall/snabbswitch,mixflowtech/logsensor,dpino/snabb