Errwrap everywhere (#4252)

* package api

* package builtin/credential

* package builtin/logical

* package command

* package helper

* package http and logical

* package physical

* package shamir

* package vault

* package vault

* address feedback

* more fixes

api/ssh_agent.go

@@ -7,6 +7,7 @@ import (
 	"io/ioutil"
 	"os"
 
+	"github.com/hashicorp/errwrap"
 	"github.com/hashicorp/go-cleanhttp"
 	"github.com/hashicorp/go-multierror"
 	"github.com/hashicorp/go-rootcerts"
@@ -141,12 +142,12 @@ func LoadSSHHelperConfig(path string) (*SSHHelperConfig, error) {
 func ParseSSHHelperConfig(contents string) (*SSHHelperConfig, error) {
 	root, err := hcl.Parse(string(contents))
 	if err != nil {
-		return nil, fmt.Errorf("ssh_helper: error parsing config: %s", err)
+		return nil, errwrap.Wrapf("error parsing config: {{err}}", err)
 	}
 
 	list, ok := root.Node.(*ast.ObjectList)
 	if !ok {
-		return nil, fmt.Errorf("ssh_helper: error parsing config: file doesn't contain a root object")
+		return nil, fmt.Errorf("error parsing config: file doesn't contain a root object")
 	}
 
 	valid := []string{
@@ -170,7 +171,7 @@ func ParseSSHHelperConfig(contents string) (*SSHHelperConfig, error) {
 	}
 
 	if c.VaultAddr == "" {
-		return nil, fmt.Errorf("ssh_helper: missing config 'vault_addr'")
+		return nil, fmt.Errorf("missing config 'vault_addr'")
 	}
 	return &c, nil
 }
@@ -248,8 +249,7 @@ func checkHCLKeys(node ast.Node, valid []string) error {
 	for _, item := range list.Items {
 		key := item.Keys[0].Token.Value().(string)
 		if _, ok := validMap[key]; !ok {
-			result = multierror.Append(result, fmt.Errorf(
-				"invalid key '%s' on line %d", key, item.Assign.Line))
+			result = multierror.Append(result, fmt.Errorf("invalid key %q on line %d", key, item.Assign.Line))
 		}
 	}