Fix clifford simulator run for qobj (#1125)
Fix clifford simulator run for qobj (#1125)

The qobj conversion for the clifford simulator was incorrectly treating
a qobj object as a dict and trying to access it like one. This commit
fixes this by converting an input qobj object into a dict, performing
the transforms and then making a new qobj from that dit to pass to
run().

Fixes #1119
QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py