Jordan Tells Federal Grand Jury Of Helping Lewinsky in Job Hunt
Vernon E Jordan Jr appears before grand jury probing Pres Clinton's relationship with Monica S Lewinsky; testifies about his efforts to find Lewinsky lawyer and job shortly after she was named possible witness in Paula Corbin Jones's sexual misconduct suit against Clinton; reportedly paints self as faithful Clinton friend who helped Lewinsky without knowing why his aid was sought; says his friendship with Clinton remains strong; chronology of Jordan's involvement with Lewinsky; photo (M)