[lldb] Fix log output and UtilityTests/LogChannelTest.List
[lldb] Fix log output and UtilityTests/LogChannelTest.List

I refactored this code in 372691 and it seems I didn't fully
replicate the original log output, so that test was failing.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@372696 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb