tests: Support running the testsuite on tmpfs
tests: Support running the testsuite on tmpfs

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

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