fixup live install (#853988, #854962)
    
    liveinst:
      use /dev/mapper/live-osimg-min as the install source. This is the original
      filesystem before changes made by the live boot scripts.
      updates overwrite unconditionally
    
    anaconda:
      handle livecd: method, set method to 'livecd' and partition to the path.
    
    packaging:
      Move new-kernel-pkg creation into a helper method, _recreateInitrds
      Add a flag to prevent running new-kernel-pkg more than once
    
    livepayload:
      mount the install source on INSTALL_TREE and rsync it to the ROOT_PATH
      Don't use verbose with rsync, results in huge program.log and slows
      down install. Error will be logged.
      Ignore rsync errors. It has problems with selinux xattrs. Log the
      return value, but continue.
      Call _recreateInitrds to create the initrd (#853988)