Add another test case for file updates

tests/tc014/expected1.txt

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+identifiers
+doStuff1	f

tests/tc014/expected2.txt

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+identifiers
+doStuff1	f
+doStuff2	f

tests/tc014/file.d

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+import testfile2;
+
+void main()
+{
+	doStu
+}

tests/tc014/run.sh

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+set -e
+set -u
+
+cp testfile2_old.d ../imports/testfile2.d
+# Sleep because modification times aren't stored with granularity of less
+# than one second
+sleep 1s;
+
+dcd-client file.d -c39 > actual1.txt
+diff actual1.txt expected1.txt
+
+cp testfile2_new.d ../imports/testfile2.d
+# Same here
+sleep 1s;
+
+dcd-client file.d -c39 > actual2.txt
+diff actual2.txt expected2.txt

tests/tc014/testfile2_new.d

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+module testfile2;
+
+void doStuff1();
+void doStuff2();

tests/tc014/testfile2_old.d

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+module testfile2;
+
+void doStuff1();