qemu.test: Add check_unhalt_vcpu test case

    Kvm-test: Move files to right place and small bug fix

    Signed-off-by: Yiqiao Pu <ypu@redhat.com>

    KVM-Test: Increase sleep time in check_unhalt_vcpu

    cpu usage is 100% at first in check_unhalt_vcpu testing,
    but it decrease after several second,
    10s is too short, increase the sleep time

    Signed-off-by: Suqin Huang <shuang@redhat.com>

    KVM-test: fix of get qemu pid

    After mgoldish's change, vm.get_pid() rightly returns qemu's pid. No need us
    'pgrep -P $shell_pid'.

    Signed-off-by: Amos Kong <akong@redhat.com>

    KVM: Check unhalt vcpu of guest.

    (1) Use qemu-img create any image which can not boot.
    (2) Start vm with the image created by step 1
    (3) Use ps get qemu-kvm process %cpu, if greater than 90%, report fial.

    Signed-off-by: sshang <sshang@redhat.com>