btrfs: Apply default flags BEFORE detecting type
btrfs: Apply default flags BEFORE detecting type

Closes #3409

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

jsavikko/lxd,Skarlso/lxd,techtonik/lxd,hallyn/lxd,lxc/lxd,Skarlso/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,lxc/lxd,mjeanson/lxd,stgraber/lxd,mjeanson/lxd,jsavikko/lxd,mjeanson/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,erikmack/lxd,Skarlso/lxd,pcdummy/lxd,techtonik/lxd,erikmack/lxd,stgraber/lxd,hallyn/lxd,techtonik/lxd,stgraber/lxd,jsavikko/lxd,stgraber/lxd,atxwebs/lxd,atxwebs/lxd,hallyn/lxd,hallyn/lxd,Skarlso/lxd,atxwebs/lxd,pcdummy/lxd,pcdummy/lxd,atxwebs/lxd,erikmack/lxd