tests: Don't use :memory:
tests: Don't use :memory:

Jenkins seems to indicate that :memory: is racy somehow and since we
have our own private LXD_DIR for this, might as well use it.

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

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