Lots of fixes for issues found by podman.
overlay: propagate errors from mountProgram
utils: root in a userns uses global conf file
Fix handling of additional stores
Correctly check permissions on rootless directory
Fix possible integer overflow on 32bit builds
Evaluate device path for lvm
lockfile test: make concurrent RW test determinisitc
lockfile test: make concurrent read tests deterministic
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>