LLAP: Append attempt id either to thread name or NDC

Currently, in LLAP attempt id gets appended to both thread name and added to NDC creating long log lines like below

[TezTaskRunner_attempt_1448393634013_0008_1_03_000000_0[attempt_1448393634013_0008_1_03_000000_0]]

I think it will be sufficient to add only to NDC.