ktest: Reset saved min (force) configs for each test

The min configs are saved in a perl hash called force_configs, and this
hash is used to add configs to the .config file. But it was not being
reset between tests and a min config from a previous test would affect
the min config of the next test causing undesirable results.

Reset the force_config hash at the start of each test.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index c8a42d5..c444c4f 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -3634,6 +3634,8 @@
 
     $iteration = $i;
 
+    undef %force_config;
+
     my $makecmd = set_test_option("MAKE_CMD", $i);
 
     # Load all the options into their mapped variable names