Remove some unused imports

Author: mhallin

src/executor_tests/directives.rs

@@ -1,7 +1,6 @@
 use std::collections::HashMap;
 
 use value::Value;
-use ast::InputValue;
 use executor::Variables;
 use schema::model::RootNode;
 use types::scalars::EmptyMutation;

src/macros/tests/args.rs

@@ -1,5 +1,3 @@
-use std::collections::HashMap;
-
 use executor::Variables;
 use value::Value;
 use schema::model::RootNode;