Allow to configure actions

[mib1185]

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name: Allow to configure actions
about: This adds support to configure actions

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Describe the change
With this we are able to also configure actions by creating proper *.local files under /etc/fail2ban/action.d/.

Testing
Goal is to set the blocktype for the iptables action to a silent DROP - therefore we use the following inventory variable:

fail2ban_action_configurations:
  - action: iptables
    section: Init
    option: blocktype
    value: DROP
  - action: iptables
    section: Init?family=inet6
    option: blocktype
    value: DROP

which results in

# cat /etc/fail2ban/action.d/iptables.local

[Init]
blocktype = DROP
[Init?family=inet6]
blocktype = DROP

#  iptables -L -nv
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
  210 19478 f2b-apache  6    --  *      *       0.0.0.0/0            0.0.0.0/0            multiport dports 80,443

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain f2b-apache (1 references)
 pkts bytes target     prot opt in     out     source               destination
    5   260 DROP       0    --  *      *       10.xx.yyy.zz         0.0.0.0/0
  200 18958 RETURN     0    --  *      *       0.0.0.0/0            0.0.0.0/0

[mib1185]

Hi @robertdebock do you mind to give this a review? thx 👍

[FLAK-ZOSO]

Any update @robertdebock?