[build] Improve coreteam generation:
[build] Improve coreteam generation:

Previous version injected a literal "-e" through "echo -e".
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karies/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,olifre/root,karies/root,karies/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root