post-review fixes

include/my_sys.h:
  added prototype for the defaults correction function
libmysql/Makefile.shared:
  my_chsize added to libmysql to let my_correct_defaults_file be used from libmysql
mysys/default.c:
  New defaults function added we use it to correct defaults file. Currently the function doesn't lock defaults
  file. This is because of the linking and backwards-compatibility issues. This needs to be fixed later.
mysys/my_chsize.c:
  comment added
server-tools/instance-manager/buffer.cc:
  cleanup
server-tools/instance-manager/commands.cc:
  refactoring: removed do_command method from most of the classes
server-tools/instance-manager/commands.h:
  cleanup
server-tools/instance-manager/guardian.cc:
  cleanup
server-tools/instance-manager/instance.cc:
  cleanup
server-tools/instance-manager/instance_map.cc:
  cleanup
server-tools/instance-manager/instance_options.cc:
  cleanup
server-tools/instance-manager/instance_options.h:
  cleanup
server-tools/instance-manager/listener.cc:
  cleanup
server-tools/instance-manager/log.cc:
  cleanup
server-tools/instance-manager/manager.cc:
  cleanup
server-tools/instance-manager/messages.cc:
  new errors added
server-tools/instance-manager/mysql_connection.cc:
  cleanup
server-tools/instance-manager/mysql_manager_error.h:
  new error codes added
server-tools/instance-manager/mysqlmanager.cc:
  clenup
server-tools/instance-manager/options.cc:
  cleanup
server-tools/instance-manager/parse.cc:
  removed unused function
server-tools/instance-manager/parse.h:
  removed prototype
server-tools/instance-manager/protocol.cc:
  cleanup
server-tools/instance-manager/protocol.h:
  added enum to be used in protocol.cc instead of the constants

server-tools/instance-manager/options.cc

@@ -158,7 +158,7 @@ static void passwd()
 
   fprintf(stderr, "Creating record for new user.\n");
   fprintf(stderr, "Enter user name: ");
-  if (! fgets(user, sizeof(user), stdin))
+  if (!fgets(user, sizeof(user), stdin))
   {
     fprintf(stderr, "Unable to read user.\n");
     return;