simplify roles organization and renames

playbooks/mediavault.yml

playbooks/mediaworker.yml

playbooks/mirismanager.yml

playbooks/monitor.yml

playbooks/msmonitor.yml

playbooks/netcapture.yml

playbooks/pod.yml

playbooks/postgres.yml

playbooks/server.yml

playbooks/tests.yml

playbooks/vault.yml

playbooks/worker.yml

playbooks/wowza.yml

requirements.dev.in

requirements.dev.txt

requirements.txt

roles/base/meta/main.yml

roles/bench-server/meta/main.yml

roles/bench-worker/meta/main.yml

roles/celerity/meta/main.yml