Add dumping of backend configuration channels field and update mock b…

…ackends (Qiskit/qiskit#5577)

* Add support for dumping channels to pulse backend configuration.

* Added reno.

* Fix some tests broken by mock backend updates.

* Correct sequencer test behaviour.

* Update travis install order to install qiskit-aer earlier.

* Update mock backends.

* Add additional basis gates rz, sx, x, with gphase to basicaer.

* Update basicaer to use qiskit gates.

* Fix lint

* Fix some test failures

* Fix lint

* Update mock backends.

* Add mock backends for casablanca, lima, quito and sydney.

* Fix bugs resulting from new calibrations.

* Update api snapshots to latest versions

* Fix test that expected identical behaviour between sequencer and scheduler.

Co-authored-by: Kevin Krsulich <[email protected]>
Co-authored-by: Matthew Treinish <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

test/test_measure_error_mitigation.py

@@ -121,7 +121,7 @@ def test_measurement_error_mitigation_with_vqe(self):
         result = vqe.compute_minimum_eigenvalue(operator=h2_hamiltonian)
         self.assertGreater(quantum_instance.time_taken, 0.)
         quantum_instance.reset_execution_results()
-        self.assertAlmostEqual(result.eigenvalue.real, -1.86, places=2)
+        self.assertAlmostEqual(result.eigenvalue.real, -1.86, delta=0.05)
 
 
 if __name__ == '__main__':