[core.config] Remove type checking of `arg' in `config.app()'. (It's done in `parse_app_arg'.)
[core.config] Remove type checking of `arg' in `config.app()'.
(It's done in `parse_app_arg'.)

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