fixes /issues/407 incorrect path in the swagger files

Author: marinovszkiarpad

kernel_gateway/jupyter_websocket/swagger.json

@@ -222,7 +222,7 @@
         }
       }
     },
-    "/kernels/{kernel_id}/interrupt": {
+    "/api/kernels/{kernel_id}/interrupt": {
       "parameters": [
         {
           "$ref": "#/parameters/kernel"
@@ -238,7 +238,7 @@
         }
       }
     },
-    "/kernels/{kernel_id}/restart": {
+    "/api/kernels/{kernel_id}/restart": {
       "parameters": [
         {
           "$ref": "#/parameters/kernel"

kernel_gateway/jupyter_websocket/swagger.yaml

@@ -171,7 +171,7 @@ paths:
       responses:
         200:
           description: The connection will be upgraded to a websocket.
-  /kernels/{kernel_id}/interrupt:
+  /api/kernels/{kernel_id}/interrupt:
     parameters:
       - $ref: "#/parameters/kernel"
     post:
@@ -181,7 +181,7 @@ paths:
       responses:
         204:
           description: Kernel interrupted
-  /kernels/{kernel_id}/restart:
+  /api/kernels/{kernel_id}/restart:
     parameters:
       - $ref: "#/parameters/kernel"
     post: