qemu: Remove need for qemuDomainParseIOThreadAlias
    
    Rather than have a separate routine to parse the alias of an iothread
    returned from qemu in order to get the iothread_id value, parse the alias
    when returning and just return the iothread_id in qemuMonitorIOThreadInfoPtr
    
    This set of patches removes the function, changes the "char *name" to
    "unsigned int" and handles all the fallout.