Fix propagation of grad_combo_fn (Qiskit/qiskit-aqua#1407)
Fix propagation of grad_combo_fn (Qiskit/qiskit-aqua#1407)

* fix propagation of grad_combo_fn

* fix trailing whitespaces

* add reno

* fix in more places

* fix trailing bracket

* wrap state info into property

* fix mypy

Co-authored-by: Manoel Marques <ea0e1aac252908b77f7a6302e9c3d004f36f7b3f@ibm.com>
QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py