fix python twitter.common.string.basic_scanf
fix python twitter.common.string.basic_scanf

ScanfResult has groups(), but not grouped().

https://github.com/twitter/commons/blob/caece3a053df29ac489d6bfc938f7f9f23b27e25/src/python/twitter/common/string/scanf.py#L23
brutkin/commons,abel-von/commons,ericzundel/commons,brutkin/commons,brutkin/commons,ericzundel/commons,atollena/commons,nkhuyu/commons,pombredanne/commons,jsirois/commons,nkhuyu/commons,Yasumoto/commons,atollena/commons,jsirois/commons,jsirois/commons,cevaris/commons,Yasumoto/commons,WCCCEDU/twitter-commons,cevaris/commons,nkhuyu/commons,WCCCEDU/twitter-commons,cevaris/commons,abel-von/commons,Yasumoto/commons,ericzundel/commons,ericzundel/commons,abel-von/commons,cevaris/commons,pombredanne/commons,atollena/commons,brutkin/commons,pombredanne/commons,jsirois/commons,Yasumoto/commons,Yasumoto/commons,pombredanne/commons,abel-von/commons,nkhuyu/commons,WCCCEDU/twitter-commons,WCCCEDU/twitter-commons,jsirois/commons,ericzundel/commons,pombredanne/commons,WCCCEDU/twitter-commons,atollena/commons,brutkin/commons,atollena/commons,nkhuyu/commons,abel-von/commons,cevaris/commons