Fix go 1.3 build.
Fix go 1.3 build.

Signed-off-by: Michael McCracken <678f76d0129c6a47299e3c6abb92ed26d253a960@canonical.com>

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