virt.tests: update iometer_windows test

Add new method  utils_misc.get_winutils_vol() to get winutils cdrom volume ID by Volume ID (ISO file need to create by command: mkisofs -J  -V "WIN_UTILS" -o winutils.iso /xxxxx) to avoid incorrect volume ID when use extra CDROM; 

Instead format disk related code with run sub test format_disk to avoid duplicate configuration;

Move icf file from winutils.iso to deps folder, it easy to track what changed for our test and update icf will become more easy if want to adjust test;

Thanks,
Xu