Ensure we become root before installing package, and add a Vagrant test as the…

Ensure we become root before installing package, and add a Vagrant test as the docker test didn't catch that

molecule/vagrant/tests/test_default.py

+import os
+
+import testinfra.utils.ansible_runner
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_scl_is_installed(host):
+    package = host.package('centos-release-scl')
+    assert package.is_installed
+
+
+def test_sclo_rh_repository_is_enabled(host):
+    cmd = host.run('yum repolist enabled | grep centos-sclo-rh | wc -l')
+
+    assert cmd.rc == 0
+    assert int(cmd.stdout.strip()) == 1
+
+
+def test_sclo_sclo_repository_is_enabled(host):
+    cmd = host.run('yum repolist enabled | grep centos-sclo-sclo | wc -l')
+
+    assert cmd.rc == 0
+    assert int(cmd.stdout.strip()) == 1