e2e-disruptors make target fails due to a concurrency issue creating the e2e test cluster

[pablochacin]

make e2e-disruptors
go build -tags e2e -o build/e2e-cluster ./cmd/e2e-cluster/main.go
build/e2e-cluster setup
cluster "e2e-test" created
E2E_REUSE=1 go test -tags e2e ./e2e/disruptors/...
--- FAIL: Test_PodDisruptor (0.14s)
    pod_e2e_test.go:39: failed to create cluster: failed to lock config file: open /tmp/e2e-test.lock: file exists
FAIL
FAIL    github.com/grafana/xk6-disruptor/e2e/disruptors 15.902s
FAIL