Kernel prepatch 4.19-rc1

Linus has released 4.19-rc1 and closed themerge window for this development cycle. "This was a fairlyfrustrating merge window, partly because 4.19 looks to be a pretty bigrelease (no single reason), and partly just due to random noise. We had theL1TF hw vulnerability disclosure early in the merge window, which justadded the usual frustration due to having patches that weren't public. Thatjust shows just how good all our infrastructure for linux-next and variousautomated testing systems have become, in how painful it is when it'slacking."