trivial: Rename directory for os-keypairs samples

We have a custom of naming the directory after the API. Reinforce that
here.

Change-Id: I5bf68aacc1d987400a91467835c4b55f03c18beb
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

api-ref/source/os-keypairs.inc

@@ -41,7 +41,7 @@ Response
 
 **Example List Keypairs (v2.35): JSON response**
 
-.. literalinclude:: ../../doc/api_samples/keypairs/v2.35/keypairs-list-resp.json
+.. literalinclude:: ../../doc/api_samples/os-keypairs/v2.35/keypairs-list-resp.json
    :language: javascript
 
 Create Or Import Keypair
@@ -72,7 +72,7 @@ Request
 
 **Example Create Or Import Keypair (v2.10): JSON request**
 
-.. literalinclude:: ../../doc/api_samples/keypairs/v2.10/keypairs-import-post-req.json
+.. literalinclude:: ../../doc/api_samples/os-keypairs/v2.10/keypairs-import-post-req.json
    :language: javascript
 
 Response
@@ -90,7 +90,7 @@ Response
 
 **Example Create Or Import Keypair (v2.10): JSON response**
 
-.. literalinclude:: ../../doc/api_samples/keypairs/v2.10/keypairs-import-post-resp.json
+.. literalinclude:: ../../doc/api_samples/os-keypairs/v2.10/keypairs-import-post-resp.json
    :language: javascript
 
 Show Keypair Details
@@ -131,7 +131,7 @@ Response
 
 **Example Show Keypair Details (v2.10): JSON response**
 
-.. literalinclude:: ../../doc/api_samples/keypairs/v2.10/keypairs-get-resp.json
+.. literalinclude:: ../../doc/api_samples/os-keypairs/v2.10/keypairs-get-resp.json
    :language: javascript
 
 Delete Keypair

nova/tests/functional/api_sample_tests/test_keypairs.py

@@ -23,7 +23,7 @@ from nova.tests.unit import fake_crypto
 
 class KeyPairsSampleJsonTest(api_sample_base.ApiSampleTestBaseV21):
     microversion = None
-    sample_dir = "keypairs"
+    sample_dir = 'os-keypairs'
     expected_delete_status_code = 202
     expected_post_status_code = 200
 
@@ -246,7 +246,7 @@ class KeyPairsV210SampleJsonTestNotAdmin(KeyPairsV210SampleJsonTest):
 
 class KeyPairsV235SampleJsonTest(api_sample_base.ApiSampleTestBaseV21):
     ADMIN_API = True
-    sample_dir = "keypairs"
+    sample_dir = 'os-keypairs'
     microversion = '2.35'
     expected_post_status_code = 201
     scenarios = [('v2_35', {'api_major_version': 'v2.1'})]