libsysutils: const correctness fixes + remove some debugging

Signed-off-by: San Mehat <san@google.com>
diff --git a/include/sysutils/SocketClient.h b/include/sysutils/SocketClient.h
index cde64a5..469dd9d 100644
--- a/include/sysutils/SocketClient.h
+++ b/include/sysutils/SocketClient.h
@@ -15,8 +15,8 @@
 
     int getSocket() { return mSocket; }
 
-    int sendMsg(int code, char *msg, bool addErrno);
-    int sendMsg(char *msg);
+    int sendMsg(int code, const char *msg, bool addErrno);
+    int sendMsg(const char *msg);
 };
 
 typedef android::List<SocketClient *> SocketClientCollection;