[enh] Make WS2P tests run faster

test/integration/ws2p_client_limitations.ts

test/integration/ws2p_cluster.ts

test/integration/ws2p_connection.ts

test/integration/ws2p_doc_sharing.ts

test/integration/ws2p_docpool.ts

test/integration/ws2p_exchange.ts

test/integration/ws2p_heads.ts

test/integration/ws2p_network.ts

test/integration/ws2p_pulling.ts

test/integration/ws2p_server_limitations.ts