Increase granularity of deployment progress bar

This is accomplished by increasing the nesting level of the API call that
retrieves stack resources.

Change-Id: I8bf631fad378e4b28bdeda60cd6c90a10e434881
Closes-Bug: 1688630

releasenotes/notes/heat-progress-b2a6997ab840ef9b.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes `bug 1688630 <https://launchpad.net/bugs/1688630>`__
+    Increase granularity of deployment progress bar to provide more accurate
+    feedback

src/js/services/HeatApiService.js

@@ -51,7 +51,9 @@ class HeatApiService {
   }
 
   getResources(stackName, stackId) {
-    return this.defaultRequest(`/stacks/${stackName}/${stackId}/resources`);
+    return this.defaultRequest(
+      `/stacks/${stackName}/${stackId}/resources?nested_depth=3`
+    );
   }
 
   getResource(stack, resourceName) {