Minimal console messages

[sswaroopgupta]

Expected behavior
When gauge specs are run, the messages on the console can be minimum

Actual behavior
Apart from the statistics and the run information, the following is also getting printed

Microsoft (R) Build Engine version 15.5.180.51428 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 16.95 ms for <projpath>\testFolder\dotnet\dotnet.csproj.
  dotnet -> <projpath>\testFolder\dotnet\bin\Release\netstandard2.0\dotnet.dll
  dotnet -> <projpath>\testFolder\dotnet\gauge-bin\

Version

Gauge version: 0.9.8.nightly-2018-02-02
Commit Hash: bff4f46

Plugins
-------
dotnet (0.0.1.nightly-2018-02-05)

[sriv]

Cannot seem to get rid of this:

Microsoft (R) Build Engine version 15.5.180.51428 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

from the dotnet cli.

I added a -q flag to suppress the project logs. These can be enabled when using DEBUG log level.

Fix should be available in nightly >= 12/02/18