Added missing properties for databases and server (#373)

* added get database info to admin service

* refactored code to be inline with standard

* added comments to utils functions

* added comments to public classes

* added machine name to serverinfo from connection; added last backupdate and last log backup date to database info

* removed camelcase from request type

* removed the wrapper for the generic dictionary

* removed unnecessary imports

* merged master

* changed datetime compare to equality operator

* added database compatability level to info

* renamed field

* fixed CompatibilityLevel string typo, added bakcup dates to capabilities list

src/Microsoft.SqlTools.ServiceLayer/Admin/AdminService.cs

@@ -151,7 +151,7 @@ namespace Microsoft.SqlTools.ServiceLayer.Admin
             }
 
             await requestContext.SendResult(new GetDatabaseInfoResponse(){
-                Result = info
+                DatabaseInfo = info
             });
         }