Allow connections on non-default port (#462)

* Allow custom port

* Update unit tests for port property

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/ConnectionDetails.cs

@@ -418,6 +418,22 @@ namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
             }
         }
 
+        /// <summary>
+        /// Gets or sets the port to use for the TCP/IP connection
+        /// </summary>
+        public int? Port
+        {
+            get
+            {
+                return GetOptionValue<int?>("port");
+            }
+
+            set
+            {
+                SetOptionValue("port", value);
+            }
+        }        
+
         /// <summary>
         /// Gets or sets a string value that indicates the type system the application expects.
         /// </summary>

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/ConnectionDetailsExtensions.cs

@@ -43,7 +43,8 @@ namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
                 MultipleActiveResultSets = details.MultipleActiveResultSets,
                 PacketSize = details.PacketSize,
                 TypeSystemVersion = details.TypeSystemVersion,
-                ConnectionString = details.ConnectionString
+                ConnectionString = details.ConnectionString,
+                Port = details.Port
             };
         }
     }