Delete move constructor/assignment operator from RSocketClient
Delete move constructor/assignment operator from RSocketClient

Summary: `RSocketClient` is not moveable due to the `const shared_ptr<ConnectionFactory>` member. As a result, some build configurations may fail with an error stating that `default` move constructor/assignment operators cannot be generated.

Reviewed By: rhodo

Differential Revision: D15888868

fbshipit-source-id: b9773b5e9452cba8c346c7277acbeddfa1966def

phoad/rsocket-cpp,ReactiveSocket/reactivesocket-cpp,phoad/rsocket-cpp,ReactiveSocket/reactivesocket-cpp,rsocket/rsocket-cpp,ReactiveSocket/reactivesocket-cpp,rsocket/rsocket-cpp,phoad/rsocket-cpp,phoad/rsocket-cpp,rsocket/rsocket-cpp,phoad/rsocket-cpp,rsocket/rsocket-cpp