Pull seed node IPs from DNS pool

Honor follow_mode set in app env

Match on the right return

Co-authored-by: Abhay Kumar <abhay@helium.com>

Remove stale helper functions from tests

Disable fetching latest snapshot on validators

Bump core and update blessed snap

```
Height 1118110
NumBlocks 72
StartBlockHt 1118089
EndBlockHt 1118160
Hash <<127,204,161,67,65,97,118,98,168,208,165,210,45,123,135,53,213,17,178,88,
       166,124,83,82,145,99,78,135,242,204,121,102>> (<<"7fcca14341617662a8d0a5d22d7b8735d511b258a67c535291634e87f2cc7966">>)
```

Temporarily make more seed nodes static

Address old TODO about local election txn submission

Allow for custom API base URL in sys.config

in case of a long startup, keep checking for the chain

Limit the size and age of rocksdb log files

We've observed extremely large rocksdb log files (1gb+) in the field. We
don't need or want the logs that large, so impose some size and time
rotation limits.

core to 2021.11.22.1

Add audit 106

Add the buildkite tag instead of fetching all tags and filtering

Bump validator version

explicitly calling up build tag sha and deleting all but the exact tag

Add audit 105