New test common project for database connections using the settings.json (#210)

* moved test driver tests and test common classes to separate projects

test/Microsoft.SqlTools.ServiceLayer.Test.Common/Scripts/CreateTestDatabase.sql

@@ -0,0 +1,13 @@
+USE master
+GO
+
+DECLARE @dbname nvarchar(128)
+SET @dbname = N'#DatabaseName#'
+
+IF NOT(EXISTS (SELECT name 
+FROM master.dbo.sysdatabases 
+WHERE ('[' + name + ']' = @dbname 
+OR name = @dbname)))
+BEGIN
+	CREATE DATABASE #DatabaseName#
+END