tests: move mock config.yaml files to common directory

Test configuration files (except modules.yaml) were in the root level of
test/data, but should really just be in their own directory.  The absence
of modules.yaml was also breaking module tests if we got module
preferences after tests started, as the mock modules.yaml was not in the
test directory.

lib/spack/spack/test/conftest.py

@@ -363,23 +363,16 @@ def configuration_dir(tmpdir_factory, linux_os):
     """
     tmpdir = tmpdir_factory.mktemp('configurations')
 
-    # Name of the yaml files in the test/data folder
-    test_path = py.path.local(spack.paths.test_path)
-    compilers_yaml = test_path.join('data', 'compilers.yaml')
-    packages_yaml = test_path.join('data', 'packages.yaml')
-    config_yaml = test_path.join('data', 'config.yaml')
-    repos_yaml = test_path.join('data', 'repos.yaml')
+    # <test_path>/data/config has mock config yaml files in it
+    # copy these to the site config.
+    test_config = py.path.local(spack.paths.test_path).join('data', 'config')
+    test_config.copy(tmpdir.join('site'))
 
-    # Create temporary 'site' and 'user' folders
-    tmpdir.ensure('site', dir=True)
+    # Create temporary 'defaults', 'site' and 'user' folders
     tmpdir.ensure('user', dir=True)
 
-    # Copy the configurations that don't need further work
-    packages_yaml.copy(tmpdir.join('site', 'packages.yaml'))
-    config_yaml.copy(tmpdir.join('site', 'config.yaml'))
-    repos_yaml.copy(tmpdir.join('site', 'repos.yaml'))
-
-    # Write the one that needs modifications
+    # Slightly modify compilers.yaml to look like Linux
+    compilers_yaml = test_config.join('compilers.yaml')
     content = ''.join(compilers_yaml.read()).format(linux_os)
     t = tmpdir.join('site', 'compilers.yaml')
     t.write(content)