Fix hpc parameters handling

doc/example_real_backend.rst

@@ -127,6 +127,15 @@ The parameters can be specified to ``QuantumProgram.compile()`` and
                            'omp_num_threads': 16
                        })
 
+If the ``ibmqx_hpc_qasm_simulator`` backend is used and the ``hpc`` parameter
+is not specified, the following values will be used by default:
+
+.. code-block:: python
+    hpc={
+        'multi_shot_optimization': True,
+        'omp_num_threads': 16
+    }
+
 
 Please note that these parameters must only be used for the
 ``ibmqx_hpc_qasm_simulator``, and will be reset to None along with emitting

qiskit/backends/_qeremote.py

@@ -63,7 +63,16 @@ class QeRemote(BaseBackend):
         hpc = None
         if (qobj['config']['backend'] == 'ibmqx_hpc_qasm_simulator' and
            'hpc' in qobj['config']):
-            hpc = qobj['config']['hpc']
+            try:
+                # Use CamelCase when passing the hpc parameters to the API.
+                hpc = {
+                    'multiShotOptimization':
+                        qobj['config']['hpc']['multi_shot_optimization'],
+                    'ompNumThreads':
+                        qobj['config']['hpc']['omp_num_threads']
+                }
+            except:
+                hpc = None
 
         output = self._api.run_job(api_jobs, qobj['config']['backend'],
                                    shots=qobj['config']['shots'],