Fix Mockito initMocks deprecation warnings

Fix Mockito initMocks deprecation warnings

This method is replaced by openMocks(testClass).close().
The close method should however only be called after completed usage
of testClass.
If using static-mocks or custom MockMakers, using this method might
cause misbehavior of mocks injected into the test class.

https://www.javadoc.io/doc/org.mockito/mockito-core/3.4.0/org/mockito/MockitoAnnotations.html

Signed-off-by: guillaume.lambert <guillaume.lambert@orange.com>
Change-Id: Ic7090902319a172606383b5352d4275172de9219