Drop tests

They do not work for quite long time.

Signed-off-by: Igor Raits <ignatenkobrain@fedoraproject.org>

tests/.fmf/version

@@ -1 +0,0 @@
-1

tests/provision.fmf

@@ -1,5 +0,0 @@
----
-standard-inventory-qcow2:
-  qemu:
-    # `cargo test` usually eats more than 1G.
-    m: 4G

tests/tests.yml

@@ -1,13 +0,0 @@
----
-- hosts: localhost
-  roles:
-  - role: standard-test-basic
-    tags:
-    - classic
-    repositories:
-    - repo: "https://src.fedoraproject.org/tests/rust.git"
-      dest: rust
-    tests:
-    - rust/cargo-test
-    environment:
-      pkg: rust-rand_xorshift0.1