kolab from server:Kolab:UNSTABLE project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/server:Kolab:UNSTABLE/openSUSE_Tumbleweed/server:Kolab:UNSTABLE.repo
zypper refresh
zypper install kolab

For 15.6 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/server:Kolab:UNSTABLE/15.6/server:Kolab:UNSTABLE.repo
zypper refresh
zypper install kolab

For 15.5 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/server:Kolab:UNSTABLE/15.5/server:Kolab:UNSTABLE.repo
zypper refresh
zypper install kolab

For 16.0 run the following as root:

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