Operator network scanning tool

[pschork]

Scans operator network to collect semver node info Targets node retrieval port allowing script to run from any host. Note that we are getting a few refused requests which implies that some operators might be filtering/whitelisting retrieval port.

Current testnet results

+------------+-------+
| SEMVER     | COUNT |
+------------+-------+
| refused    |    14 |
| timeout    |    18 |
| <0.8.0     |    55 |
| 0.8.0-rc.1 |     7 |
+------------+-------+
| TOTAL      |    94 |
+------------+-------+

Example output

opscan % ./bin/opscan                                                                               
Aug 16 00:09:07.175 WRN cmd/main.go:111 NodeInfo semver=refused error="rpc error: code = Unavailable desc = connection error: desc = \"transport: Error while dialing: dial tcp 209.127.245.214:32005: connect: connection refused\""
Aug 16 00:09:07.798 WRN cmd/main.go:111 NodeInfo semver=<0.8.0 error="rpc error: code = Unimplemented desc = unknown method NodeInfo for service node.Retrieval"
Aug 16 00:09:21.333 WRN cmd/main.go:111 NodeInfo semver=timeout error="rpc error: code = DeadlineExceeded desc = context deadline exceeded"
Aug 16 00:09:11.160 INF cmd/main.go:115 NodeInfo semver=0.8.0-rc.1 os=linux arch=amd64 numCpu=12 memBytes=33535475712

Checks

• [x] I've made sure the lint is passing in this PR.
• [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, in that case, please comment that they are not relevant.
• Testing Strategy
  • [ ] Unit tests
  • [x] Integration tests
  • [ ] This PR is not tested :(

[pschork]

Will parallelize the scan to speed things up

[jianoaix]

Shall we put it to dataapi so it can reach the port as disperser, and get NodeInfo more reliably?

[pschork]

• properly resolves full active operator set by resolving all registrations/deregistrations
• detects release src compiles that support NodeInfo but lack semver
• added worker pool

+-------------+-------+
| SEMVER      | COUNT |
+-------------+-------+
| 0.7.5-pre.1 |     1 |
| src-compile |     1 |
| timeout     |     2 |
| 0.8.0-rc.1  |    28 |
| 0.8.0       |     4 |
| <0.8.0      |   114 |
| refused     |     6 |
+-------------+-------+
| TOTAL       |   156 |
+-------------+-------+