unit tests: change orekit_jpype references to orekit

test-in-development/PythonDocstringTest.py

test-in-development/TLEConverterTest.py

test/AltitudeDetectorTest.py

test/BackAndForthDetectorTest.py

test/BrouwerLyddanePropagatorTest.py

test/Context.py

test/EstimationTestUtils.py

test/EventDetectorTest.py

test/EventHandlerTest.py

test/FieldStopOnDecreasingTest.py

test/GroundFieldOfViewDetectorTest.py

test/ImpulseManeuverTest.py

test/InterSatDirectViewDetectorTest.py

test/IodGibbsTest.py

test/IodLaplaceTest.py

test/KeplerianConverterTest.py

test/KlobucharModelTest.py

test/MeasurementCreator.py

test/NodeDetectorTest.py

test/OrekitStepHandlerTest.py