Print all open ports

[pavolloffay]

Requirement - what kind of business use case are you trying to solve?

Every binary should print all open ports on startup. This makes it easy to find the port and connect. The log message should contain info about the port - e.g. what it is used for.

[pavolloffay]

For example collector does not say anything about opening 14267 for jaeger agent.

SPAN_STORAGE_TYPE=elasticsearch go run ./cmd/collector/main.go                                                                                           4:04 
{"level":"info","ts":1537365891.8120868,"caller":"healthcheck/handler.go:99","msg":"Health Check server started","http-port":14269,"status":"unavailable"}
{"level":"info","ts":1537365894.9461088,"caller":"static/strategy_store.go:77","msg":"No sampling strategies provided, using defaults"}
{"level":"info","ts":1537365894.9463255,"caller":"collector/main.go:141","msg":"Registering metrics handler with HTTP server","route":"/metrics"}
{"level":"info","ts":1537365894.9463742,"caller":"collector/main.go:149","msg":"Starting HTTP server","http-port":14268}
{"level":"info","ts":1537365894.946397,"caller":"healthcheck/handler.go:133","msg":"Health Check state change","status":"ready"}

[yurishkuro]

+1