Missing quote was courtesy of is-tty lacking trailing semi-colon.  Refactor test report paths into vars to shorten coverage command line and have named files to for clean target to remove

Change-Id: I30bed3351f69aee67167ca13dba71bad7357928d
diff --git a/tests/results/.gitignore b/tests/results/.gitignore
index d6b7ef3..28da4c4 100644
--- a/tests/results/.gitignore
+++ b/tests/results/.gitignore
@@ -1,2 +1,8 @@
+# -*- makefile -*-
+
 *
 !.gitignore
+*.out
+*.xml
+
+# [EOF]
\ No newline at end of file