move core tests to core (#3355)

* move core tests to core

* remove window

* fix up flaky tests

* test_entryfication needs a singly-threaded banking_stage

* move core benches to core

* remove unnecessary dependencies

* remove core as a member for now, test it like runtime

* stop running tests twice

* remove duplicate runs of tests in perf

core/benches/gen_keys.rs

@@ -0,0 +1,12 @@
+#![feature(test)]
+
+extern crate test;
+
+use solana::gen_keys::GenKeys;
+use test::Bencher;
+
+#[bench]
+fn bench_gen_keys(b: &mut Bencher) {
+    let mut rnd = GenKeys::new([0u8; 32]);
+    b.iter(|| rnd.gen_n_keypairs(1000));
+}