http: raise exception if expired token (#880)

- add raise DCOSAuthenticationException in dcos.http.request if token is
   invalid.
 - raise DCOSAuthenticationException or DCOSAuthorizationException in
   dcos.packagemanager.PackageManager().has_capability if user is not logged in

dcos/http.py

@@ -159,7 +159,7 @@ def request(method,
         if auth_token is not None:
             msg = ("Your core.dcos_acs_token is invalid. "
                    "Please run: `dcos auth login`")
-            raise DCOSException(msg)
+            raise DCOSAuthenticationException(msg)
         else:
             raise DCOSAuthenticationException(response)
     elif response.status_code == 422:

dcos/packagemanager.py

@@ -67,6 +67,10 @@ class PackageManager:
         try:
             response = self.cosmos.call_endpoint(
                 'capabilities').json()
+        except DCOSAuthenticationException:
+            raise
+        except DCOSAuthorizationException:
+            raise
         except Exception as e:
             logger.exception(e)
             return False