Pass namespace to the Vault client (#1660)

The namespace was plumbed all the way through the API but isn't actually
set on the client when it is created.

Fixes #1597

CHANGELOG.md

@@ -22,6 +22,9 @@ Canonical reference for changes, improvements, and bugfixes for Boundary.
   a missing mandated cipher suite of the HTTP/2 (`h2`) specification that could
   result in no shared cipher suites between the Boundary API listener and those
   clients. ([PR](https://github.com/hashicorp/boundary/pull/1637))
+* vault: Fix credential store support when using Vault namespaces
+  ([Issue](https://github.com/hashicorp/boundary/issues/1597),
+  [PR](https://github.com/hashicorp/boundary/pull/1660))
 
 ## 0.6.2 (2021/09/27)
 

internal/credential/vault/vault.go

@@ -79,6 +79,10 @@ func newClient(c *clientConfig) (*client, error) {
 	}
 	vClient.SetToken(string(c.Token))
 
+	if c.Namespace != "" {
+		vClient.SetNamespace(c.Namespace)
+	}
+
 	return &client{
 		cl:    vClient,
 		token: c.Token,