_SdlProtocolBase sets the wrong protocol version on the first packet received

[renonick87]

Bug Report

The SdlProtocolBase sets its major protocol version based on the header of the first packet it receives from core. However in the case where the major version is > 5, the SdlProtocolBase was incorrectly attempting to set the minor version as well.

Reproduction Steps

1. SdlProtocolBase's _setVersion method uses 5.1.0 but it should only use major versions.

Expected Behavior

The protocol version should be set to v5.0.0.

Test Case, Sample Code, and / or Example App

1. Add a console.log to check the protocol version in the SdlProtocolBase's _handlePacketReceived method:

if (this._protocolVersion === null || this._protocolVersion.getMajor() === 1) {
            this._setVersion(sdlPacket.getVersion());
            console.log(this._protocolVersion);
        }

2. The protocol version will be logged when the first packet is received from core.