aufs6 GIT release (v6.6.54, v6.10.13, and v6.12-rc2)

[J. R. Okajima]

o news
- new aufs6.6.54 and aufs6.10.13 branches are released, requested by PB
  on github.
- aufs source files are unchaged but supports linux-v6.12-rc2.


J. R. Okajima