Add flag to have openstack client re-auth when token expires

Signed-off-by: Steve Sloka <steves@heptio.com>

discovery/cmd/openstack-discoverer/main.go

@@ -171,6 +171,7 @@ func main() {
 		Password:         password,
 		DomainName:       userDomainName,
 		TenantName:       tenantName,
+		AllowReauth:      true,
 	}
 
 	if err := gopheropenstack.Authenticate(osClient, osAuthOptions); err != nil {

discovery/pkg/openstack/httplogger.go

@@ -14,7 +14,7 @@
 package openstack
 
 import (
-	"fmt"
+	"log"
 	"math"
 	"net/http"
 	"net/http/httptrace"
@@ -56,7 +56,7 @@ func (lrt *LogRoundTripper) RoundTrip(request *http.Request) (*http.Response, er
 
 	if response.StatusCode == http.StatusUnauthorized {
 		if lrt.numReauthAttempts == 3 {
-			return response, fmt.Errorf("tried to re-authenticate 3 times with no success")
+			log.Fatal("tried to re-authenticate 3 times with no success")
 		}
 		lrt.numReauthAttempts++
 	}