In 877eafa49b , pkg/server started
importing pkg/client , since the server has to be able to fetch blobs
from a share claim of another server. This introduced a circular
dependency in tests, as pkg/client/upload_test.go instantiates a server.
As the test uses both a client and a server, and tests uploading between
the two, it seems fitting to move it to pkg/test/integration, which
breaks the circular dep.
Change-Id: I2458ffd72912ff6e9c1a0f67e187d54cc895c2e9