install: Use overlayfs instead of unionfs.

I dediced to keep adding /tmp as tmpfs since I was not able to trigger bug
while still using unionfs, so I could not verify whether this mount is still
needed with overlayfs.  Mapping /tmp to tmpfs does not harm, so we are on the
save side.

* gnu/system/install.scm (make-cow-store): Mount /gnu/store without additional
  read-only bind-mount, since in overlayfs the "lower" level is always
  read-only. Add work-dir required by overlayfs. No need to sleep anymore
  since now using the mount syscall. [unionfs]: Remove now unused function.
  (%installation-services): Update comment.
  (installation-os)[file-systems]: Update comment.

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