qemu.tests.pci_hotplug: Use human_monitor_cmd API to get devices list

This test may run with qmp monitor, so the supported device
querying function should use human_monitor_cmd API explicitly.

Signed-off-by: Qingtang Zhou <qzhou@redhat.com>
qemu.tests.cfg: Remove cpu model definition in physical_resources_check

The cpu model checking in this test is really weird and
unnecessary anymore, so remove config for cpu model and
skip this test step.

Signed-off-by: Qingtang Zhou <qzhou@redhat.com>
shared.cfg.guest-hw: Move ethtool's config to its own config file

The config variants in guest-hw.cfg file would overwite config
in the test case, thus let's put them all in test's config file
directly.

CC: Yunping Zheng <yunzheng@redhat.com>
Signed-off-by: Qingtang Zhou <qzhou@redhat.com>
shared.cfg.guest-hw: Move jumbo's config into its config file

CC: Yunping Zheng <yunzheng@redhat.com>
Signed-off-by: Qingtang Zhou <qzhou@redhat.com>