Add database URL. (#365)

* Add database URL.

This allows specification of either a file://, env://, or other string.
If it starts with file:// or env:// the actual value will be read from
those resources.

* Tidy up the KMS output

* Also run migrations in test mode when specifying the URL

internal/servers/controller/testing.go

@@ -11,6 +11,7 @@ import (
 	"github.com/hashicorp/boundary/api/authtokens"
 	"github.com/hashicorp/boundary/internal/cmd/base"
 	"github.com/hashicorp/boundary/internal/cmd/config"
+	"github.com/hashicorp/boundary/internal/db"
 	"github.com/hashicorp/boundary/internal/iam"
 	"github.com/hashicorp/boundary/internal/servers"
 	"github.com/hashicorp/go-hclog"
@@ -343,6 +344,9 @@ func NewTestController(t *testing.T, opts *TestControllerOpts) *TestController {
 
 	if opts.DatabaseUrl != "" {
 		tc.b.DatabaseUrl = opts.DatabaseUrl
+		if err := db.InitStore("postgres", nil, tc.b.DatabaseUrl); err != nil {
+			t.Fatal(err)
+		}
 		if err := tc.b.ConnectToDatabase("postgres"); err != nil {
 			t.Fatal(err)
 		}