graph: do not remove tempfile when opening in viewer

system/t14_graph/CreateGraphOutputTest_gold

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+Generating graph...
+Output saved to /tmp/aptly-graph.png

system/t14_graph/CreateGraphTest_gold

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+Generating graph...
+Displaying png file: xdg-open /tmp/aptly-graph1173098610.png

system/t14_graph/graph.py

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+"""
+Test aptly graph
+"""
+
+import os
+import re
+
+from lib import BaseTest
+
+
+class CreateGraphTest(BaseTest):
+    """
+    open graph in viewer
+    """
+    fixtureCmds = ["mkdir -p ../build", "ln -fs /bin/true ../build/xdg-open"]
+    environmentOverride = {"PATH": os.environ["PATH"] + ":../build"}
+    runCmd = "aptly graph"
+
+    def outputMatchPrepare(self, s):
+        return re.sub(r"[0-9]", "", s)
+
+    def teardown(self):
+        self.run_cmd(["rm", "-f", "../build/xdg-open"])
+
+
+class CreateGraphOutputTest(BaseTest):
+    """
+    open graph in viewer
+    """
+    runCmd = "aptly graph -output /tmp/aptly-graph.png"
+
+    def teardown(self):
+        self.run_cmd(["rm", "-f", "/tmp/aptly-graph.png"])