tests: Fix PID handling in fdleak test
tests: Fix PID handling in fdleak test

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

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