Australia shares seen opening firm, NZ stocks steady

SYDNEY, Aug 11 (Reuters) - Australian shares are likely to have a firm start on Tuesday, taking the lead from a rally on Wall Street on rising commodity shares and news of a mega deal by Berkshire. Australia's share price index futures rose 0.7 percent to 5,481, a 28.2-point discount to the close of the underlying S&P/ASX200 index on Monday. The benchmark gained 0.6 percent in the previous session. Cochlear, Transurban and Wotif are due to release earnings on Tuesday. New Zealand's b