Log Message:
Updated security/cyrus-sasl to 2.1.21.  Changes from version 2.1.20 include:

* lib/dlopen.c: log the reason for opendir() failure
  when loading plugin.
* lib/common.c: honor log level setting
* sample/sample-client.c, sample/sample-server.c: Fixed several
  64 bit portability warnings.
* utils/testsuite.c: Fixed several 64 bit portability warnings.
* utils/saslpasswd.c: Fixed typo in an auxprop name.
* include/saslplug.h, lib/common.c, lib/saslint.h,
  lib/server.c: Added sasl_server_plugin_info().
* lib/common.c: initialize path in case caller didn't.