This patch adds several new tests for SetupDiInstallClassExA.
Basically it proves that SetupDiInstallClassExA shouldn't fail if there isn't a Current32Install.Nt.Service section in the INF file.
Our current API fails* if there is none:
/* Install .Services section */
ret = SetupInstallServicesFromInfSectionExW( hInf, SectionName, 0, hDeviceInfo, NULL, NULL, NULL);
*Actually it doesn't fail due a bug in SetupInstallServicesFromInfSectionExW,which returns true even if the SectionName doesn't exist at all. Fixing that bug, this bug is revealed.