removing the first beginReporStep() for well model

[GitPaean]

it will be called in a later stage.

creating the test to evaluate whether it impacts any situations.

[GitPaean]

jenkins build this please

[GitPaean]

To the extent that jekins test can cover, it does not look like it causes any regression. I am marking the PR to be ready for review and potentially to get the PR in.

[GitPaean]

For the information, the WellModel::beginReportStep() will be called in a later stage at

opm-simulators/opm/simulators/flow/SimulatorFullyImplicitBlackoil.hpp

Line 377 in d58fcf0

this->solver_->model().beginReportStep();