Refactor textToQualifiedNameList()

Hi,

When working on other patch[1], I found there are almost same
functions, texttoQualifiedNameList() and stringToQualifiedNameList().
The only difference is the argument type, text or char*. I don't know
why these functions are defined seperately, but I think the former 
function can be rewritten using the latter code as the attached patch.
Is this reasonable fix?

Regards,
-- 
Yugo Nagata <nagata@sraoss.co.jp>