[libvirt] ESX [10/12]: Replace esxUtil_EqualSuffix() with virFileHasSuffix()

* src/esx/esx_util.[ch]: remove esxUtil_EqualSuffix() * src/esx/esx_driver.c, src/esx/esx_vmx.c: replace esxUtil_EqualSuffix() with virFileHasSuffix()