virt.shared.cfg: Set mac_changeable to no in unattended_install.

Signed-off-by: Feng Yang <fyang@redhat.com>
libvirt_xml.devices: Add slots for channel.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
utils_test.libvirt: Support discard for creating disk xml.

Signed-off-by: Yu Mingfei <yumingfei@cn.fujitsu.com>
Merge pull request #1759 from FengYang/mac_changeable

virt.shared.cfg: Set mac_changeable to no in unattended_install.
libvirt_xml_unittest.py: Suppress pylint E1003

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #1809 from autotest/fix-pylint-error

libvirt_xml_unittest.py: Suppress pylint E1003
Merge pull request #1784 from yumingfei/discard

libvirt_xml.channel enhancements&Discard configurations
virttest.utils_test.libvirt: Add export_options in pre_pool params

Add support setup netfs with export options like 'root_squash' other
than default 'no_root_squash'.

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