libnftnl from home:garloff project

对于 CentOS 8，请以根用户 root 运行下面命令：

cd /etc/yum.repos.d/
wget https://download.opensuse.org/repositories/home:garloff/CentOS_8/home:garloff.repo
yum install libnftnl

对于 openSUSE Tumbleweed，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:garloff/openSUSE_Tumbleweed/home:garloff.repo
zypper refresh
zypper install libnftnl

对于 openSUSE Factory RISCV，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:garloff/openSUSE_Factory_RISCV/home:garloff.repo
zypper refresh
zypper install libnftnl

对于 openSUSE Factory ARM，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:garloff/openSUSE_Factory_ARM/home:garloff.repo
zypper refresh
zypper install libnftnl

对于 openSUSE Factory，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:garloff/openSUSE_Factory/home:garloff.repo
zypper refresh
zypper install libnftnl

对于 16.0，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:garloff/16.0/home:garloff.repo
zypper refresh
zypper install libnftnl

对于 15.7，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:garloff/15.7/home:garloff.repo
zypper refresh
zypper install libnftnl

对于 15.6，请以根用户 root 运行下面命令：

zypper addrepo https://download.opensuse.org/repositories/home:garloff/15.6/home:garloff.repo
zypper refresh
zypper install libnftnl