Fix a bug of CircuitSampler (Qiskit/qiskit-aqua#1235)
Fix a bug of CircuitSampler (Qiskit/qiskit-aqua#1235)

* fix the order of circuits in CircuitSampler

* add a unit test
QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py