Upgrade to net core 2.0 (#356)

* Initial .net core 2.0 conversion

* Convert a few more projects to .net core 2.0

* Convert a few more projects to .net core 2.0

* Fix build.cmd errors

* Add mising nuget package

* Remove dead code

* Add checked in references to workaround nuget package issues

* Update SLN file to refer to correct csproj files

* Rename applications to workaround .net core tooling bug

* Update nuget package with SQL Parser changes

* Add PreserveCompliationContext to avoid MEF bug

* Update smo version to pickup .net core 2 changes

* Pickup latest SMO changes to fix merge break

* Actually pickup correct SMO binaries

* Add support for SLES 12.2

* Fix break running archiving on Linux

* Revert "Add support for SLES 12.2"

This reverts commit 95cdb6d0e35a425be5c0081345d214079cbdc3db.

* Update to latest SMO build

* Install .Net Core 2 during install phase

* Move .Net Core install

* Try to reference dotnet.exe directly

* Fix code coverage script for CSPROJ instead of project.json

* Turn off test that is unreliable in AppVeyor builds.

* Fix appveyor.yml line feed.

* Turn off another flaky test failing in AppVeyor

src/Microsoft.SqlTools.Hosting/packages.config

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="System.Data.SqlClient" version="4.4.0-preview1-25305-02" />
+	<package id="Microsoft.SqlServer.Smo" version="140.17054.0" />
+	<package id="Microsoft.SqlServer.Management.SqlScriptPublishModel" version="140.17050.0" />
+	<package id="Newtonsoft.Json" version="10.0.2" />
+	<package id="Microsoft.Extensions.DependencyModel" version="2.0.0-preview1-002111" />
+	<package id="System.Runtime.Loader" version="4.3.0" />
+	<package id="System.Composition" version="1.0.31-beta-24326-02" />
+</packages>