Test destroy without close in bufferhub vts

Add a test case called "DestroyClientWithoutClose".

Move the code looking for bufferhub service to a common SetUp function.

Close the client in DuplicateAndImportBuffer since it's the recommended
use case of the interface.

Test: VtsHalBufferHubV1_0TargetTest
Bug: 122916649
Change-Id: I55015117aa7339ae927269520ac319d2fe7439ac