Put files into the SFTP remote root

instead of just wherever we happen to be

Change-Id: I2ac7e2a9b3c20db67961b4ae5f4506a5ff27aa65
Merge remote-tracking branch 'gerrit/master' into HEAD

Change-Id: I47311eaf2d3c005b54b0b7339fb226d68fdd1b3d