Don't load non json body

Some neutron POST APIs don't return response body, for instance,
dhcp-agent-network-add and l3-agent-router-add. However,
BaseNetworkClient passes all response body to json.loads.
This patch add a check for response body.

Change-Id: I7a4c565f9e067e1771bf6ec85c9c0486937a2cef
Related-Bug: #1555921
diff --git a/tempest/lib/services/network/base.py b/tempest/lib/services/network/base.py
index a6ada04..620e0f1 100644
--- a/tempest/lib/services/network/base.py
+++ b/tempest/lib/services/network/base.py
@@ -54,18 +54,26 @@
         self.expected_success(200, resp.status)
         return rest_client.ResponseBody(resp, body)
 
-    def create_resource(self, uri, post_data):
+    def create_resource(self, uri, post_data, expect_empty_body=False):
         req_uri = self.uri_prefix + uri
         req_post_data = json.dumps(post_data)
         resp, body = self.post(req_uri, req_post_data)
-        body = json.loads(body)
+        # NOTE: RFC allows both a valid non-empty body and an empty body for
+        # response of POST API. If a body is expected not empty, we decode the
+        # body. Otherwise we returns the body as it is.
+        if not expect_empty_body:
+            body = json.loads(body)
         self.expected_success(201, resp.status)
         return rest_client.ResponseBody(resp, body)
 
-    def update_resource(self, uri, post_data):
+    def update_resource(self, uri, post_data, expect_empty_body=False):
         req_uri = self.uri_prefix + uri
         req_post_data = json.dumps(post_data)
         resp, body = self.put(req_uri, req_post_data)
-        body = json.loads(body)
+        # NOTE: RFC allows both a valid non-empty body and an empty body for
+        # response of PUT API. If a body is expected not empty, we decode the
+        # body. Otherwise we returns the body as it is.
+        if not expect_empty_body:
+            body = json.loads(body)
         self.expected_success(200, resp.status)
         return rest_client.ResponseBody(resp, body)