Use SAL_INFO() instead of printf()

printf() and SAL_INFO() / SAL_DEBUG() output apparently don't end up in
correct order in a cppunit log file which can be extremely confusing. So let's
use SAL_INFO() (with the tag sc.qa) for the qahelper debug output.

Change-Id: I529482c07651f84688ec5751d2b3dfc7d89cb4ca