Check whether INDIRECT_DESCRIPTORS feature was negotiated.
Check whether INDIRECT_DESCRIPTORS feature was negotiated.

In that case, provide different implementations for get_desc().

Signed-off-by: Nikolay Nikolaev <5fb6ff14f2a3b931c007d120a649a55e86928f6a@virtualopensystems.com>

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