tests: rename from test-config-case.t to test-config.t for centralization stable

tests: rename from test-config-case.t to test-config.t for centralization

Before this patch, there is no test script testing configuration
handling generally. "test-config-case.t" seems to be specific for
testing case sensitive configuration.

This patch renames from "test-config-case.t" to "test-config.t" for
centralization of tests around configuration handling.

--- a/tests/test-config-case.t	Thu Apr 25 20:48:49 2013 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,11 +0,0 @@
-hide outer repo
-  $ hg init
-
-  $ echo '[Section]' >> $HGRCPATH
-  $ echo 'KeY = Case Sensitive' >> $HGRCPATH
-  $ echo 'key = lower case' >> $HGRCPATH
-
-  $ hg showconfig Section
-  Section.KeY=Case Sensitive
-  Section.key=lower case
-

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-config.t	Fri Apr 26 23:16:25 2013 +0900
@@ -0,0 +1,13 @@
+hide outer repo
+  $ hg init
+
+Test case sensitive configuration
+
+  $ echo '[Section]' >> $HGRCPATH
+  $ echo 'KeY = Case Sensitive' >> $HGRCPATH
+  $ echo 'key = lower case' >> $HGRCPATH
+
+  $ hg showconfig Section
+  Section.KeY=Case Sensitive
+  Section.key=lower case
+