PciAssignable: Make nic_name_re configurable.

nic_name_re used to filter nic name in host.

Signed-off-by: Feng Yang <fyang@redhat.com>
PciAssignable: Do not modprobe it, if self.driver is not available.

Signed-off-by: Feng Yang <fyang@redhat.com>
utils_test.libvirt: Fix parameter undefined error.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
virttest/virsh.py: Add 'to_file' to capabilities func
Merge pull request #1859 from yumingfei/utils_test_fix

utils_test.libvirt: Fix parameter undefined error.
Merge pull request #1869 from PandaWei/capability

virttest/virsh.py: Add 'to_file' to capabilities func
Merge pull request #1722 from FengYang/PciAssignable

Two update for PciAssignable class
virttest.nfs: support NFS client setup

Signed-off-by: Alex Jia <ajia@redhat.com>