Update suc alert color

Update the back groud color for succesful alert messages.

Issue-ID: CLAMP-815
Change-Id: I97a621e31f2eb850eae30da3754afd3cd4ddb34a
Signed-off-by: xuegao <xg353y@intl.att.com>
diff --git a/ui-react/src/__snapshots__/LoopUI.test.js.snap b/ui-react/src/__snapshots__/LoopUI.test.js.snap
index 9de232d..e523de9 100644
--- a/ui-react/src/__snapshots__/LoopUI.test.js.snap
+++ b/ui-react/src/__snapshots__/LoopUI.test.js.snap
@@ -89,27 +89,50 @@
     render={[Function]}
   />
   <GlobalStyleComponent />
-  <Alert
-    closeLabel="Close alert"
-    dismissible={true}
-    onClose={[Function]}
-    show={false}
-    transition={
-      Object {
-        "$$typeof": Symbol(react.forward_ref),
-        "defaultProps": Object {
-          "appear": false,
-          "in": false,
-          "mountOnEnter": false,
-          "timeout": 300,
-          "unmountOnExit": false,
-        },
-        "displayName": "Fade",
-        "render": [Function],
+  <div>
+    <Alert
+      closeLabel="Close alert"
+      dismissible={true}
+      onClose={[Function]}
+      show={false}
+      transition={
+        Object {
+          "$$typeof": Symbol(react.forward_ref),
+          "defaultProps": Object {
+            "appear": false,
+            "in": false,
+            "mountOnEnter": false,
+            "timeout": 300,
+            "unmountOnExit": false,
+          },
+          "displayName": "Fade",
+          "render": [Function],
+        }
       }
-    }
-    variant="danger"
-  />
+      variant="success"
+    />
+    <Alert
+      closeLabel="Close alert"
+      dismissible={true}
+      onClose={[Function]}
+      show={false}
+      transition={
+        Object {
+          "$$typeof": Symbol(react.forward_ref),
+          "defaultProps": Object {
+            "appear": false,
+            "in": false,
+            "mountOnEnter": false,
+            "timeout": 300,
+            "unmountOnExit": false,
+          },
+          "displayName": "Fade",
+          "render": [Function],
+        }
+      }
+      variant="danger"
+    />
+  </div>
   <Navbar
     collapseOnSelect={false}
     expand={true}