Save agentless state

[xr09]

This PR fixes #349 by adding the agentless dir to our list of persistent locations.

[xr09]

Since the complete data volume is being granted rw permissions for the group it is required to undo that action for the scripts/binaries inside agentless dir, since agentlessd process won't execute these as a security measure.

wazuh_1          | 2020/06/05 16:24:08 ossec-agentlessd: ERROR: At wpopenv(): file '/var/ossec/agentless/ssh_generic_diff' has write permissions.
wazuh_1          | 2020/06/05 16:24:08 ossec-agentlessd: ERROR: Expect command not found (or bad arguments) for 'ssh_generic_diff'.

On 489bd01 these permissions were reverted to its original state.