fate: support testing of release branches
Adding 'branch=release/10' to the fate config file will check the release/10 branch instead of master. If no branch is specified it will use 'master' so that existing config are still valid. The server side changes are already deployed, see https://fate.libav.org/v10/ for an example. The server supports only the release/* branches. The server enforces that a single slot tests always the same branch. Please append "-v$RELEASE" to the slot of release branch configs or make the slot otherwise unique. A different fate samples dir is needed for each release branch. make fate-rsync has the correct URL in each branch.
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