tp-libvirt: Add option(managedsave and snapshot) test for undefine

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
libvirt.test: Fix a bug in setvcpus test

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
Merge pull request #136 from liyangfnst/setvcpus_fix

libvirt.test: Fix a bug in setvcpus test
Merge pull request #129 from liyangfnst/dumpxml_opt

libvirt.test: Add '--managed-save' and '--snapshots-metadata' test for undefine
libvirt.test: Move domblkinfo test to monitor group

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
Merge pull request #144 from liyangfnst/domblkinfo

libvirt.test: Move domblkinfo test to monitor group
vol_create: Update specific error msg for skip cases

As test on rhel7 with rhev qemu, the error msg is different from
upstream qemu, so update the error msg which from qemu-img to
skip unsupported img type cases.

Signed-off-by: Wayne Sun <gsun@redhat.com>