split 3.0 and 3.2 tests and remove references to system.indexes collection in 3.2

Author: saghm

tests/client/db.rs

@@ -19,6 +19,7 @@ fn create_collection() {
         .expect("Failed to execute list_collections command.");;
 
     let results = cursor.next_n(5).unwrap();
+
     assert_eq!(3, results.len());
 
     match results[0].get("name") {

tests/lib.rs

@@ -5,9 +5,6 @@ extern crate rand;
 extern crate rustc_serialize;
 extern crate nalgebra;
 
-mod apm;
-mod auth;
-mod client;
 mod json;
-mod sdam;
-mod server_selection;
+mod v3_0;
+mod v3_2;