Fix test failure on non-Windows OS.

NewTestController now sets the site root to '.' to accomodate Windows.  This introduced a failure on Linux because we join "." and an absolute path in /tmp/ and end up looking for the temp file in the wrong place.  This change puts the temp file under the current working directory, which should resolve the issue.

config/setup/basicauth_test.go

@@ -38,7 +38,7 @@ func TestBasicAuthParse(t *testing.T) {
 md5:$apr1$l42y8rex$pOA2VJ0x/0TwaFeAF9nX61`
 
 	var skipHtpassword bool
-	htfh, err := ioutil.TempFile("", "basicauth-")
+	htfh, err := ioutil.TempFile(".", "basicauth-")
 	if err != nil {
 		t.Logf("Error creating temp file (%v), will skip htpassword test", err)
 		skipHtpassword = true