qemu.control.kernel-version: Bug fix for control.kernel-version

This patch fix three problems in control.kernel-version:
  - Fix the wrong variable name.
  - Remove the parse_file inside control file for host-kernel.cfg
    Just in clude it as other cfg files in your tests-example.cfg
    which is more flexible. And this also can work with the situation
    that without host-kernel.cfg.
  - Don't get the package version if there is no need for package
    version check.

Also add some docstring for how to use the package filter.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
virttest.qemu_storage: Refactoring and new compare_images method

Refactor qemu_storage.QemuImg() so that it's more logical
to query for available qemu-img commands. Also, introduce
a method .compare_images() method that will take 2 images
and compare them using the subcommand 'compare', if it is
available.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
qemu.test: merge block_mirror test

* Fix incorrect command when run test with qmp monitor;
* Fix logical error that target image file should not
  be opened before the reopen step;
* Merge configuration file into drive_mirror.cfg
* Use by default upstream block mirror names rather than
  assuming RHEL block mirror names.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Signed-off-by: Xu Tian <xutian@redhat.com>
virt: Unifies composition of path.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
virt: ignore github report tool cache files

Signed-off-by: Chris Evich <cevich@redhat.com>
shared.cfg: Add guest Win8

Signed-off-by: Qingtang Zhou <qzhou@redhat.com>
shared.cfg: Add guest Win2012

Signed-off-by: Qingtang Zhou <qzhou@redhat.com>
Merge pull request #549 from zhouqt/new-guests

Shared: Add new guests Win8 and Win2012
Merge pull request #528 from ypu/kernel-version

qemu.control.kernel-version: Bug fix for control.kernel-version
qemu.tests.cgroup: make some modify of cgroup and add more log info

This patch fix some issues of cgroups, and add more test steps
info