python-ethtool from home:orcharhino:sles_15_py3 project

需要 15.4 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:orcharhino:sles_15_py3/15.4/home:orcharhino:sles_15_py3.repo
zypper refresh
zypper install python-ethtool