Bump tools

[mvandeberg]

Brief description

Updates repo to use golang 1.18.x, fixes gcov2lcov installation, replaces deprecated golint, and fixes linter errors

Checklist

• [X] I have built this pull request locally
• [X] I have ran the unit tests locally
• [X] I have manually tested this pull request
• [X] I have reviewed my pull request
• [X] I have added any relevant tests

Demonstration

$ go test ./...
?       github.com/koinos/koinos-p2p/cmd/koinos-p2p     [no test files]
ok      github.com/koinos/koinos-p2p/internal   (cached)
ok      github.com/koinos/koinos-p2p/internal/node      (cached)
?       github.com/koinos/koinos-p2p/internal/options   [no test files]
ok      github.com/koinos/koinos-p2p/internal/p2p       (cached)
?       github.com/koinos/koinos-p2p/internal/p2perrors [no test files]
?       github.com/koinos/koinos-p2p/internal/rpc       [no test files]