GLOBAL MARKETS-Stock, oil prices gain as Brexit jitters abate

* Wall Street turns positive for year
* Britain’s FTSE 100 retraces all its post-Brexit losses
* Oil jumps on U.S (Other OTC: UBGXF – news) . drawdown, looming strike in Norway
* U.S. bond prices fall (Updates to close of U.S. markets)
By Saqib Iqbal Ahmed
NEW YORK, June 29 (Reuters) – Stock markets around the world rebounded for the second straight day on Wednesday as fears about last week’s Brexit vote eased and investors wagered central banks would ultimately ride to t