Add metrics config unit test

tests/danesfield/data/metrics-template-config.txt

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+# Template based on:
+# https://github.com/pubgeo/core3d-metrics/blob/a586a44/aoi-example/aoi-example.config
+#
+# Modifications:
+# - CLSMatchValue
+
+[INPUT.REF]
+DSMFilename   = $ref_prefix-DSM.tif
+DTMFilename   = $ref_prefix-DTM.tif
+CLSFilename   = $ref_prefix-CLS.tif
+NDXFilename   = $ref_prefix-NDX.tif
+MTLFilename   = $ref_prefix-MTL.tif
+#CLSMatchValue  = [[6],[17],[6,17],[256]]
+CLSMatchValue  = 6
+
+[INPUT.TEST]
+DSMFilename   = $test_dsm
+CLSFilename   = $test_cls
+MTLFilename   = $test_mtl
+DTMFilename   = $test_dtm
+
+[OPTIONS]
+QuantizeHeight  = false
+
+[PLOTS]
+ShowPlots       = false
+SavePlots       = true
+
+[MATERIALS.REF]
+MaterialIndices = 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14
+MaterialNames = Unclassified,Asphalt,Concrete/Stone,Glass,Tree,Non-tree vegetation,Metal,Ceramic,Soil,Solar panel,Water,Polymer,Unscored,Indeterminate,Indeterminate asphalt/concrete
+MaterialIndicesToIgnore = 0,12,13

tests/danesfield/metrics/test_metrics_config.py

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+###############################################################################
+# Copyright Kitware Inc. and Contributors
+# Distributed under the Apache License, 2.0 (apache.org/licenses/LICENSE-2.0)
+# See accompanying Copyright.txt and LICENSE files for details
+###############################################################################
+from danesfield.metrics.config import _current_path, get_filename, get_template, populate_template
+from os.path import dirname, join
+
+data_dir = join(dirname(dirname(__file__)), 'data')
+
+
+def test__current_path():
+    danesfield_root = dirname(dirname(dirname(data_dir)))
+    assert _current_path() == join(danesfield_root, 'danesfield', 'metrics')
+
+
+def test_get_filename():
+    file1 = 'test_dsm.tif'
+    file2 = 'test_cls.tif'
+    assert get_filename(file1, file2) == 'test_dsm__test_cls.config'
+
+
+def test_get_template():
+    with open(join(data_dir, 'metrics-template-config.txt'), 'r') as f:
+        contents = f.read()
+        assert get_template() == contents
+
+
+def test_populate_template():
+    template = '$ref_prefix $test_dsm $test_cls $test_mtl $test_dtm'
+    populated = populate_template(template, 'prefix', 'dsm', 'cls', 'mtl', 'dtm')
+    assert populated == 'prefix dsm cls mtl dtm'