FOREX-Dollar steadies before Yellen and ADP data, sterling shines

* Investors wary of verbal intervention from ECB's Draghi LONDON, July 2 (Reuters) - The dollar held above a two-month low against a basket of currencies on Wednesday, before the release of a survey of the U.S. labour market and a speech by Federal Reserve Chair Janet Yellen that is expected to be dovish. The euro lost some steam on concern policy makers will intervene verbally to keep the ...