Get rid of useless JCS warnings during startup

[simon04]

WARNING: No configuration settings found.  Using hardcoded default values for all pools.
WARNING: Region [TMS_BLOCK_v2] Resetting cache

Submitted upstream patches:

• ​https://github.com/apache/commons-jcs/pull/8
• ​https://github.com/apache/commons-jcs/pull/9

Alternative:

src/org/openstreetmap/josm/data/cache/JCSCacheManager.java

@@ -75 +75 @@
                     if (record.getLevel().intValue() >= Level.SEVERE.intValue()) {
                         Logging.error(msg);
                     } else if (record.getLevel().intValue() >= Level.WARNING.intValue()) {
-                        Logging.warn(msg);
-                        // downgrade INFO level to debug, as JCS is too verbose at INFO level
+                        if (msg.equals("No configuration settings found.  Using hardcoded default values for all pools.")
+                                || msg.startsWith("Region") && msg.endsWith("Resetting cache")) { // "Region [TMS_BLOCK_v2] Resetting cache"
+                            // downgrade useless warnings
+                            Logging.debug(msg);
+                        } else {
+                            Logging.warn(msg);
+                        }
                     } else if (record.getLevel().intValue() >= Level.INFO.intValue()) {
+                        // downgrade INFO level to debug, as JCS is too verbose at INFO level
                         Logging.debug(msg);
                     } else {
                         Logging.trace(msg);