fail2ban: add datepattern and conf for sshd

• add the jail.local config to enable fail2ban on ssh to prevent brute force attack
• add datepattern for fail2ban to be able to function with syslog-ng generated /var/log/messages

requested review from @sukrus

assigned to @rthakur

mentioned in merge request iopsys/iopsyswrt!320 (closed)

added 5 commits

• 3247d198...7a0db03b - 4 commits from branch devel
• 1d9276ae - fail2ban: add datepattern and conf for sshd

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added 3 commits

• 1d9276ae...5e7006f2 - 2 commits from branch devel
• 7613351a - fail2ban: add datepattern and conf for sshd

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no longer needed

closed