Copy the "tests" directory from c9s branch.

The directory was not imported when creating the c8s branch.

tests/.fmf/version

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+1

tests/provision.fmf

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+---
+standard-inventory-qcow2:
+    qemu:
+        m: 3G
+

tests/tests.yml

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+- hosts: localhost
+  roles:
+  - role: standard-test-source
+    tags:
+    - classic
+  - role: standard-test-basic
+    tags:
+    - classic
+    tests:
+    - upstream_test_suite:
+        dir: source/tests
+        run: make -f Makefile.localtest tests
+    environment:
+        CRYPTSETUP_PATH: /sbin
+    required_packages:
+    - cryptsetup
+    - cryptsetup-devel
+    - integritysetup
+    - veritysetup
+    - gcc
+    - make
+    - kernel-headers
+    - device-mapper-devel
+    - expect
+    - keyutils
+    - jq
+    - vim-common
+    - sharutils