tests: Resurrect initest input file(s).

Delete the current version of foo.ini which was modified, restore the
previous version, and initest.ini. Preprocess initest.ini which
includes foo.ini, and tidy up the resulting file. This file will
(mostly) get the initest unit test to work. Some other cleanups are
still necessary.

Change-Id: I4e46abc73ac89f88177eec92f572452f63ba8019
Reviewed-on: https://gem5-review.googlesource.com/6041
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/unittest/foo.ini

@@ -1,9 +0,0 @@
-[Foo]
-Foo1=89
-Foo2=384
-
-[General]
-Test3=89
-
-[Junk]
-Test4+=mia

src/unittest/initest.ini

@@ -0,0 +1,17 @@
+[General]
+   Test1=BARasdf
+   Test2=bar
+
+[Junk]
+Test3=yo
+Test4=mama
+
+[Foo]
+Foo1=89
+Foo2=384
+
+[General]
+Test3=89
+
+[Junk]
+Test4+=mia