added tests for kvs.get_client()
added tests for kvs.get_client()


Former-commit-id: e8f8e2d2fafc1c152b0a391a5435c1a96a8ed490 [formerly f9cd36c32a203ef8bb11d9b3702e4b5aee49610c] [formerly f9cd36c32a203ef8bb11d9b3702e4b5aee49610c [formerly 45b9137d51bde753b80602cae43900e44a613500]]
Former-commit-id: 484261d0dd6bb4d6fbbe6eddb20d25291b44ea70
Former-commit-id: 53cbc25dcd337bd6f9d8d4f2cc51c23c10200972
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine