always delete config arg in forkstart mode
always delete config arg in forkstart mode

...instead of only on successful container creation and loading of the
config file.

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>

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