test-config-case: print only the Section we're interested in.
This allows us to add additional settings to the global hgrc file
created by run-tests.py without breaking this test.
--- a/tests/test-config-case
+++ b/tests/test-config-case
@@ -4,4 +4,4 @@ echo '[Section]' >> $HGRCPATH
echo 'KeY = Case Sensitive' >> $HGRCPATH
echo 'key = lower case' >> $HGRCPATH
-hg showconfig
+hg showconfig Section