spec: Update REST API to use consistent status codes
spec: Update REST API to use consistent status codes

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

yura-pakhuchiy/lxd,ericsnowcurrently/lxd,beni55/lxd,Skarlso/lxd,achanda/lxd,dustinkirkland/lxd,pcdummy/lxd,mjeanson/lxd,ollie314/lxd,chrisglass/lxd,tych0/lxd,jensg-st/lxd,hallyn/lxd,stgraber/lxd,erikmack/lxd,lxc/lxd,atxwebs/lxd,rcj4747/lxd,rcj4747/lxd,erikmack/lxd,pcdummy/lxd,mikemccracken/lxd,lxc/lxd,sl1pm4t/lxd,dustinkirkland/lxd,smoser/lxd,akshaykarle/lxd,jsavikko/lxd,yura-pakhuchiy/lxd,stgraber/lxd,basvanbeek/lxd,yura-pakhuchiy/lxd,atxwebs/lxd,Skarlso/lxd,ollie314/lxd,Malizor/lxd,sl1pm4t/lxd,jumpstarter-io/lxd,rrva/lxd,stgraber/lxd,stgraber/lxd,chrisglass/lxd,benaryorg/lxd,techtonik/lxd,smoser/lxd,Malizor/lxd,dvbportal/osx-lxd,erikmack/lxd,chrisglass/lxd,techtonik/lxd,stgraber/lxd,ericsnowcurrently/lxd,mjeanson/lxd,dvbportal/osx-lxd,beni55/lxd,hallyn/lxd,basvanbeek/lxd,jensg-st/lxd,akshaykarle/lxd,atxwebs/lxd,mikemccracken/lxd,lxc/lxd,beni55/lxd,jumpstarter-io/lxd,hallyn/lxd,dvbportal/osx-lxd,lxc/lxd,basvanbeek/lxd,jensg-st/lxd,jsavikko/lxd,pcdummy/lxd,stgraber/lxd,hallyn/lxd,hallyn/lxd,dustinkirkland/lxd,lxc/lxd,georghopp/lxd,georghopp/lxd,georghopp/lxd,stgraber/lxd,hallyn/lxd,lxc/lxd,benaryorg/lxd,smoser/lxd,sl1pm4t/lxd,techtonik/lxd,akshaykarle/lxd,rrva/lxd,Skarlso/lxd,Skarlso/lxd,ericsnowcurrently/lxd,rcj4747/lxd,Malizor/lxd,mikemccracken/lxd,jumpstarter-io/lxd,atxwebs/lxd,tych0/lxd,lxc/lxd,achanda/lxd,jsavikko/lxd,achanda/lxd,mjeanson/lxd,tych0/lxd,ollie314/lxd,rrva/lxd,benaryorg/lxd