vsftpd security and bug fix update

[2.0.5-12]

• fix CVE-2007-5962: vsftpd memory leak when deny_file option is set
• Resolves: #423001
  [2.0.5-11]
• add new option to log login failures based on user list
• Resolves: #345791
• fix user_config_dir option
• Resolves: #400921
• allow usernames starting with ‘_’ or ‘.’
• Resolves: #386561
• fix the write/race condition when uploading files simultaneously
• Resolves: #240553
• fix the bug that causes every new file stored with STOU to have a prefix ‘.1’
• Resolves: #392231
• make vsftpd wildcard matching more greedy
• Resolves: #392181