Properly end services by using hash ids

[joeljfischer]

Bug Report

Currently, services are not ended with the hash id in the payload. To properly conform to the protocol spec, hash id payloads should be appended to the payload on protocol v4 and less, and by using BSON in v5+. To do this, we will also have to store the hash id.

Expected Behavior

Ending a service should send the proper hash id received in the start service ACK.

Observed Behavior

Ending a service sends a nil payload.

OS & Version Information

• iOS Version: n/a
• SDL iOS Version: v4.6.2
• Testing Against: n/a

Test Case, Sample Code, and / or Example App

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