Modify api-paste.ini v1 to v2 for cyborg

bump api version to v2[1]

[1]: https://review.opendev.org/#/c/700102/

Change-Id: I799f126a30081a85da4f3c41ce705c3756bbe6ba

ansible/roles/cyborg/templates/cyborg-api-paste.ini.j2

 [pipeline:main]
-pipeline = cors request_id authtoken api_v1
+pipeline = cors request_id authtoken api_v2
 
-[app:api_v1]
+[app:api_v2]
 paste.app_factory = cyborg.api.app:app_factory
 
 [filter:authtoken]
-acl_public_routes = /, /v1
+acl_public_routes = /, /v2
 paste.filter_factory = cyborg.api.middleware.auth_token:AuthTokenMiddleware.factory
 
 [filter:osprofiler]