add pstore to container fstab

Otherwise user-namespace containers will hang on mountall.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
concurrent: take lxc template to use as argument

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
api_create and api_start: work toward making them thread-safe

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Revert "api_create and api_start: work toward making them thread-safe"

This should deadlock with daemonized start due to af_unix changes.

Do this later, but do it more carefully.

This reverts commit 002f3cff4d83c0666cfda40599eded8e0d638c6c.