Switch off XML Report by default

[dboltovskyi]

Fix: #169

This PR is ready for review.

Summary

Currently ATF creates two reports:

1. ATF report - is a simple text file with all messages which are sent/or received by ATF through both SDL communication channels: MOBILE and HMI
2. XML Report - is XML file with the messages plus additional information on actual and expected results

Since (2) is in XML format which has some structure the whole document needs to be rebuilt every time new message sent/received.
Moreover content of the document needs to be stored in internal memory while script is executing.

This lead to significant performance degradation on slow environments in case of long scripts.

Since this report is rarely used nowadays the solution is to switch it off by default.

An alternative solution could be usage of another format (not XML) for this report.
However it requires much more time for implementation and motivation is not strong enough.

Changelog

• XML Report is switched off in default configuration
• dependency on excludeReport configuration parameter is removed in ATF Log (1)

CLA

• I have signed the CLA