Change in response from UAA

Starting on version 76.26.0 of UAA a change was made that changes the
behavior more context in cloudfoundry/uaa#2545

Signed-off-by: João Pereira <joaod@vmware.com>

api/uaa/error_converter.go

@@ -53,7 +53,7 @@ func convert(rawHTTPStatusErr RawHTTPStatusError) error {
 		if uaaErrorResponse.Type == "invalid_token" {
 			return InvalidAuthTokenError{Message: uaaErrorResponse.Description}
 		}
-		if uaaErrorResponse.Type == "unauthorized" {
+		if uaaErrorResponse.Type == "unauthorized" || uaaErrorResponse.Type == "invalid_client" {
 			if uaaErrorResponse.Description == "Your account has been locked because of too many failed attempts to login." {
 				return AccountLockedError{Message: "Your account has been locked because of too many failed attempts to login."}
 			}

api/uaa/error_converter_test.go

@@ -135,6 +135,22 @@ var _ = Describe("Error Wrapper", func() {
 					})
 				})
 
+				Context("invalid_client with bad credentials", func() {
+					BeforeEach(func() {
+						fakeConnectionErr.RawResponse = []byte(`{
+  "error": "invalid_client",
+  "error_description": "Bad credentials"
+}`)
+						fakeConnection.MakeReturns(fakeConnectionErr)
+					})
+
+					It("returns a BadCredentialsError", func() {
+						Expect(fakeConnection.MakeCallCount()).To(Equal(1))
+
+						Expect(makeErr).To(MatchError(UnauthorizedError{Message: "Bad credentials"}))
+					})
+				})
+
 				Context("unauthorized - too many failed login attempts", func() {
 					BeforeEach(func() {
 						fakeConnectionErr.RawResponse = []byte(`{