Merge pull request #942 from keep-network/gosec-env-var

Fix ignore comment for PasswordEnvVariable gosec

gosec command doesn't ignore the line if // #nosec is not in the first
comment line. So what would work is:

```
// #nosec G101 (look for hardcoded credentials)
// This line doesn't contain any credentials.
// It's just the name of the environment variable.
// PasswordEnvVariable environment variable name for ethereum key password.
const PasswordEnvVariable = "KEEP_ETHEREUM_PASSWORD"
```
But this makes go lint fail with exported const PasswordEnvVariable should have a comment or be unexported.

The solution in this PR makes both golint and gosec work.

Author: michalinacienciala

config/config.go

@@ -15,10 +15,7 @@ import (
 )
 
 // PasswordEnvVariable environment variable name for ethereum key password.
-// #nosec G101 (look for hardcoded credentials)
-// This line doesn't contain any credentials.
-// It's just the name of the environment variable.
-const PasswordEnvVariable = "KEEP_ETHEREUM_PASSWORD"
+const PasswordEnvVariable = "KEEP_ETHEREUM_PASSWORD" // #nosec G101 -- it's just env variable name
 
 // Config is the top level config structure.
 type Config struct {