aufs6 GIT release (v6.14.4 and v6.15-rc6)

[J. R. Okajima]

o news
- aufs6.14.4 is released based upon the report (on github) by
  Blackteahamburger.
- aufs6.x-rcN is for linux-v6.15-rc6, but aufs files are equivalent to
  last release (for linux-v6.15-rc1).

J. R. Okajima