adb: Create private key with 0600 mode

Changed key name to force generating new pairs.

Bug: 7092477
Change-Id: I680cb9dd1896ae52b2b29d63533f966e033d823f
diff --git a/adb/adb.h b/adb/adb.h
index 5e9a0fb..9da8af8 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -36,7 +36,7 @@
 #define ADB_VERSION_MAJOR 1         // Used for help/version information
 #define ADB_VERSION_MINOR 0         // Used for help/version information
 
-#define ADB_SERVER_VERSION    30    // Increment this when we want to force users to start a new adb server
+#define ADB_SERVER_VERSION    31    // Increment this when we want to force users to start a new adb server
 
 typedef struct amessage amessage;
 typedef struct apacket apacket;