Stable kernel 3.18.48

Greg Kroah-Hartman has released an unexpected3.18 kernel update, despite the fact that 3.18 is no longer supported."Turns out there was a bug in 3.18.47 in one of the backports. And abug in 3.18.27 as well, with one of the backports there. And a very minorissue in the 3.18.28 release, but no one cares about the debug messages fora specific scsi driver, so you can just ignore that issue..."