Alert should be refactor to enable _log/_action for all stats

[nicolargo]

For the moment, it is not possible to add _log/_action for all stats: it is only take into account for CPU, MEM, SWAP, LOAD...

[nicolargo]

In fact the feature is available but there is an issue when trying to generate action (Mustache) with a list.

[nicolargo]

Corrected on the develop branch.

Some examples:

[cpu]
user_critical_action=echo "{{time}} User CPU {{user}} higher than {{critical}}" > /tmp/cpu.alert

[mem]
critical_action_repeat=echo "{{time}} {{percent}} higher than {{critical}}"" >> /tmp/memory.alert

[memswap]
warning_action=echo "{{time}} {{percent}} higher than {{warning}}"" > /tmp/memory.alert

[network]
wlan0_rx_critical_action=echo "{{time}} {{interface_name}} RX {{bytes_recv_rate_per_sec}}Bps" > /tmp/network.alert

[fs]
/_critical_action=echo "{{time}} {{mnt_point}} filesystem space {{percent}}% higher than {{critical}}%" > /tmp/fs.alert

[sensors]
temperature_core_Ambient_critical_action=echo "{{time}} {{label}} temperature {{value}}{{unit}} higher than {{critical}}{{unit}}" > /tmp/temperature.alert