Restrict slave mountspace so Dalvik apps can mount system-wide volumes

Android 4.2 implements multi-user storage using per-process mount
namespaces.  Everything under "/" (the entire filesystem hierarchy) is
marked as a recursive-slave mountspace for all zygote instances.  This
is
done so that user-storage sandbox mounts under /storage/emulated are
hidden
from other apps and users.

Unfortunately this means that any Dalvik app (actually, any program
whose
clone/fork ancestry includes a Dalvik zygote, which is everything except
services spawned directly from init) cannot mount system-wide volumes.
Thus, apps like CifsManager are effectively broken in Android 4.2, since
its cifs mounts are only visible to the CifsManager app itself.  All
other
apps see empty mountpoints instead of the mounted volume.  Furthermore,
Linux provides no provision for a process to "escape" a recursive-slave
mountspace in versions prior to Linux 3.8 (setns syscall).

Here, we restrict rootfs-slave calls to /storage (and, due to a possible
kernel bug, /mnt/shell/emulated) so that Dalvik apps can mount
system-wide
volumes elsewhere (with appropriate permission, as in earlier versions
of
Android), while retaining full multi-user storage compatibility.  It is
made available as a kernel-based workaround for instances where libdvm
can
not be modified.

This change requires that a tmpfs volume is mounted as /storage in
init.rc.
If this volume is unavailable, then we falls back to the previous
behavior
of marking the entire filesystem hierarchy as slave.

*** Do not commit to CyanogenMod Project kernels, as a similar
workaround
    for this problem is patched in Zygote/Dalvik/libdvm instead.  ***