Improve tempest auth tests

Added tests to base_url method.

Also include general improves to make the fake api response look different
avoiding false positives.

Partially implements bp unit-tests

Change-Id: I5552b44998cd85c39221b8de298629e0b77f99cb
diff --git a/tempest/tests/fake_identity.py b/tempest/tests/fake_identity.py
index ea2bd44..058c9c2 100644
--- a/tempest/tests/fake_identity.py
+++ b/tempest/tests/fake_identity.py
@@ -25,16 +25,16 @@
 COMPUTE_ENDPOINTS_V2 = {
     "endpoints": [
         {
-            "adminURL": "http://fake_url/api/admin",
+            "adminURL": "http://fake_url/v2/first_endpoint/admin",
             "region": "NoMatchRegion",
-            "internalURL": "http://fake_url/api/internal",
-            "publicURL": "http://fake_url/api/public"
+            "internalURL": "http://fake_url/v2/first_endpoint/internal",
+            "publicURL": "http://fake_url/v2/first_endpoint/public"
         },
         {
-            "adminURL": "http://fake_url/api/admin",
+            "adminURL": "http://fake_url/v2/second_endpoint/admin",
             "region": "FakeRegion",
-            "internalURL": "http://fake_url/api/internal",
-            "publicURL": "http://fake_url/api/public"
+            "internalURL": "http://fake_url/v2/second_endpoint/internal",
+            "publicURL": "http://fake_url/v2/second_endpoint/public"
         },
     ],
     "type": "compute",
@@ -79,17 +79,24 @@
 COMPUTE_ENDPOINTS_V3 = {
     "endpoints": [
         {
-            "id": "fake_service",
+            "id": "first_compute_fake_service",
             "interface": "public",
             "region": "NoMatchRegion",
-            "url": "http://fake_url/v3"
+            "url": "http://fake_url/v3/first_endpoint/api"
         },
         {
-            "id": "another_fake_service",
+            "id": "second_fake_service",
             "interface": "public",
             "region": "FakeRegion",
-            "url": "http://fake_url/v3"
+            "url": "http://fake_url/v3/second_endpoint/api"
+        },
+        {
+            "id": "third_fake_service",
+            "interface": "admin",
+            "region": "MiddleEarthRegion",
+            "url": "http://fake_url/v3/third_endpoint/api"
         }
+
     ],
     "type": "compute",
     "id": "fake_compute_endpoint"