Add unit tests for threshold format

testcases/004-disk-low-threshold-format/expected_output.txt

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+BELOW_THRESHOLD

testcases/004-disk-low-threshold-format/i3status.conf

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+general {
+        output_format = "none"
+}
+
+order += "disk /"
+
+disk "/" {
+        format = "%used"
+        format_below_threshold = "BELOW_THRESHOLD"
+        low_threshold = 100
+        threshold_type = "percentage_free"
+}

testcases/005-cpu-temp-max-threshold-format/expected_output.txt

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+ABOVE_THRESHOLD: 50 °C

testcases/005-cpu-temp-max-threshold-format/i3status.conf

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+general {
+        output_format = "none"
+}
+
+order += "cpu_temperature 0"
+
+cpu_temperature 0 {
+        format_above_threshold = "ABOVE_THRESHOLD: %degrees °C"
+        max_threshold = 45
+        path = "testcases/005-cpu-temp-max-threshold-format/temp1_input"
+}

testcases/005-cpu-temp-max-threshold-format/temp1_input

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+50000

testcases/006-cpu-usage-max-threshold-format/expected_output.txt

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+ABOVE_THRESHOLD

testcases/006-cpu-usage-max-threshold-format/i3status.conf

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+general {
+        output_format = "none"
+}
+
+order += "cpu_usage"
+
+cpu_usage {
+        format_above_threshold = "ABOVE_THRESHOLD"
+        max_threshold = -1
+}

testcases/007-cpu-usage-degraded-threshold-format/expected_output.txt

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+ABOVE_THRESHOLD

testcases/007-cpu-usage-degraded-threshold-format/i3status.conf

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+general {
+        output_format = "none"
+}
+
+order += "cpu_usage"
+
+cpu_usage {
+        format_above_threshold = "ABOVE_THRESHOLD"
+        max_threshold = -1
+}

testcases/008-load-max-threshold-format/expected_output.txt

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+ABOVE_THRESHOLD

testcases/008-load-max-threshold-format/i3status.conf

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+general {
+        output_format = "none"
+}
+
+order += "load"
+
+load {
+        format_above_threshold = "ABOVE_THRESHOLD"
+        max_threshold = -1
+}