Remove unused request API sample template

There are few POST API which does not take request
body as mandatory. For example POST 'servers/%s/consoles/

For such API, functional sample tests using some empty
request sample template. And doc/api_samples dir does
not have such empty sample file.

This commit removes those empty sample files and make
_do_post() base method to make body and subs param as optional
for such API.

Also add one missing sample file(non empty) in doc/api_samples dir.

Change-Id: I163e17a4a8253594e1768ed9b118fba63d5e08f1

doc/api_samples/os-evacuate/v2.29/server-evacuate-find-host-req.json

@@ -0,0 +1,5 @@
+{
+    "evacuate": {
+        "adminPass": "MySecretPass"
+    }
+}

nova/tests/functional/api_sample_tests/test_consoles.py

@@ -33,8 +33,7 @@ class ConsolesSamplesJsonTest(test_servers.ServersSampleBase):
         self.console = self.start_service('console', host='fake')
 
     def _create_consoles(self, server_uuid):
-        response = self._do_post('servers/%s/consoles' % server_uuid,
-                                 'consoles-create-req', {})
+        response = self._do_post('servers/%s/consoles' % server_uuid)
         self.assertEqual(response.status_code, 200)
 
     def test_create_consoles(self):

nova/tests/functional/api_sample_tests/test_floating_ips.py

@@ -60,21 +60,15 @@ class FloatingIpsTest(api_sample_base.ApiSampleTestBaseV21):
                               {}, response, 200)
 
     def test_floating_ips_list(self):
-        self._do_post('os-floating-ips',
-                      'floating-ips-create-nopool-req',
-                      {})
-        self._do_post('os-floating-ips',
-                      'floating-ips-create-nopool-req',
-                      {})
+        self._do_post('os-floating-ips')
+        self._do_post('os-floating-ips')
 
         response = self._do_get('os-floating-ips')
         self._verify_response('floating-ips-list-resp',
                               {}, response, 200)
 
     def test_floating_ips_create_nopool(self):
-        response = self._do_post('os-floating-ips',
-                                 'floating-ips-create-nopool-req',
-                                 {})
+        response = self._do_post('os-floating-ips')
         self._verify_response('floating-ips-create-resp',
                               {}, response, 200)
 

nova/tests/functional/api_samples_test_base.py

@@ -495,12 +495,14 @@ class ApiSampleTestBase(integrated_helpers._IntegratedTestBase):
             return jsonutils.loads(response.content)
         return response
 
-    def _do_post(self, url, name, subs, method='POST', headers=None):
-        self.subs = subs
-        body = self._read_template(name) % self.subs
-        sample = self._get_sample(name, self.microversion)
-        if self.generate_samples and not os.path.exists(sample):
-                self._write_sample(name, body)
+    def _do_post(self, url, name=None, subs=None, method='POST', headers=None):
+        self.subs = {} if subs is None else subs
+        body = None
+        if name:
+            body = self._read_template(name) % self.subs
+            sample = self._get_sample(name, self.microversion)
+            if self.generate_samples and not os.path.exists(sample):
+                    self._write_sample(name, body)
         return self._get_response(url, method, body, headers=headers)
 
     def _do_put(self, url, name=None, subs=None, headers=None):