Fix request path to query a resource provider by uuid

To query a resource provider by uuid, request path should look like
 /resource_providers?uuid=<uuid>
istead of
 /resource_providers&uuid=<uuid>

This change fixes the wrong path so that "nova-manage placement audit"
command can look up the target resource provider properly.

Closes-Bug: #1936278
Change-Id: I2ae7e9782316e3662e4e51e3f5ba0ef597bf281b
(cherry picked from commit 1d3373d)
(cherry picked from commit 62a3fa4)

Author: kajinamit

nova/cmd/manage.py

@@ -2668,7 +2668,7 @@ def _get_resource_providers(self, context, placement, **kwargs):
         """
         url = '/resource_providers'
         if 'uuid' in kwargs:
-            url += '&uuid=%s' % kwargs['uuid']
+            url += '?uuid=%s' % kwargs['uuid']
 
         resp = placement.get(url, global_request_id=context.global_id,
                              version='1.14')