test: Randomize docker network name (#4306)

We were observing TestAuthorizeSession_Errors failing in CI due to it complaining that a docker network with name TestAuthorizeSession_Errors already exists. Looking deeper, it turns out that internal/daemon/controller/handlers/targets/tcp and internal/daemon/controller/handlers/targets/ssh both have a test with that same name, and for some reason, they often run on top of each other, causing one of the tests to fail to create a docker network.

To prevent any conflicts with tests that have the same name, this commit randomizes the network name that is created.

internal/credential/vault/supported.go

@@ -21,6 +21,7 @@ import (
 	"github.com/hashicorp/boundary/globals"
 	"github.com/hashicorp/boundary/internal/db/common"
 	"github.com/hashicorp/go-rootcerts"
+	"github.com/hashicorp/go-secure-stdlib/base62"
 	vault "github.com/hashicorp/vault/api"
 	_ "github.com/jackc/pgx/v5/stdlib"
 	"github.com/ory/dockertest/v3"
@@ -169,7 +170,9 @@ func gotNewServer(t testing.TB, opt ...TestOption) *TestVaultServer {
 	// Engine: 20.10.6
 
 	if opts.dockerNetwork {
-		network, err := pool.CreateNetwork(t.Name())
+		id, err := base62.Random(4)
+		require.NoError(err)
+		network, err := pool.CreateNetwork(fmt.Sprintf("%s-%s", t.Name(), id))
 		require.NoError(err)
 		server.network = network
 		dockerOptions.Networks = []*dockertest.Network{network}