Use the host's PID namespace for the toolbox container

It's common practice to track down a process while developing. This
could be a process that's repeatedly crashing, or something that's
misbehaving by using up too many resources. Being able to seamlessly
look at what's happening on the host makes for a better developer
experience.

The toolbox doesn't intend to provide a segregated security domains,
so this is fine.

toolbox

@@ -343,6 +343,7 @@ create()
             --interactive \
             --name $toolbox_container \
             --network host \
+            --pid host \
             --privileged \
             --security-opt label=disable \
             --tmpfs /dev/shm:size=$tmpfs_size \