restund from network:telephony project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/network:telephony/openSUSE_Tumbleweed/network:telephony.repo
zypper refresh
zypper install restund

For 15.6 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/network:telephony/15.6/network:telephony.repo
zypper refresh
zypper install restund

For 15.6 ARM run the following as root:

zypper addrepo https://download.opensuse.org/repositories/network:telephony/15.6_ARM/network:telephony.repo
zypper refresh
zypper install restund