update test results
fix compilation failure on windows
fix for ps-protocol

mysql-test/r/plugin.result:
  make sure the PS handle is closed
mysql-test/t/plugin.test:
  make sure the PS handle is closed
sql/mysqld.cc:
  compilation failure: lable without a statement.
sql/sql_plugin.cc:
  make plugin lock and plugin unlock use the same format of the dbug info string.
  print the ref_count *after* the lock and *after* the unlock.