v2v.tests: Use PoolVolumeTest to create pool for converting remote vm.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
v2v.tests: Separate xen and vmware to support both in one run.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
tests.convert_libvirt: Fix parameter for options --network/--bridge.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
v2v.tests: Adjustment to support network and bridge options.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
v2v.tests: Adjustments for converting local image.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
Merge pull request #228 from yumingfei/fix_v2v

V2V: Adjustments for fixing some bugs and some enhancements.