Bug#20535561 : CREATE USER IN BINLOG WITH LOG_BACKWARD_COMPATIBLE_USER_DEFINITIONS ON

Description: 1> When CREATE USER query is logged in binlog, in case of --log_backward_comoatible_user_definition,
                they are not logged with "IDENTIFIED BY PASSWORD <hash>". Instead, hash of hash is generated.
             2> In case of ALTER USER, additional attributes are introduced as a part of query rewrite.

Solution: 1> Renamed log-backward-compatible-user-definitions to log-builtin-as-identified-by-password
          2> If above mentioned variable is set, CREATE USER statement involving builtin authentication
             plugins will be rewritten to include "IDENTIFIED BY PASSWORD" clause. SET PASSWORD will also
             be rewritten as SET PASSWORD and not ALTER USER ... IDENTIFIED WITH ... AS ...
          3> Corrected problem of appending PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK in case of CREATE/ALTER USER

Reviewed-By: Georgi Kodinov <georgi.kodinov@oracle.com>
Reviewed-By: Bharathy Satish <bharathy.x.satish@oracle.com>