Actually when we use the command `ynh_use_logrotate /var/log/abcd/` the result in the logrotate conf file is `/opt/yunohost/abcd/logs//.log` witch is not what we want.
- fix https://dev.yunohost.org/issues/1007
- Renewing a certificate is not problematic, but creating a certificate
for a new domain name may failed according to recent feedbacks.
* Add a function to check if a dyndns provider provides a domain
* Add a function to check a domain availability from a dyndns provider
* Use new functions in dyndns_subscribe
* Replace complete madness by _dyndns_available in dyndns_update
* This regex is only used in dyndns_update, no need to define it at the whole file scope level
* Try to clarify management of old ipv4/ipv6 ...
* Add a nice helper to get both ipv4 and ipv6...
* Clarify the dyndns_update madness to get current ipv4/v6
* Remove now useless IPRouteLine
* Change default values of old ipv4/v6 to None, otherwise shit gets update just because IPv6 = None
* Rearrange thing a bit, move path to global variable
* Copypasta typo
* Dyndns zone file as a global variable
* Use helper to write zone content to file
* Adding some debugs/info messages
* Move the domain guessing to a dedicated function...
* Adding comments..
* Using subprocess check_call instead of os.system for nsupdate
* Removing dump of the zone update because it's kinda duplicated from what nsupdate already does
* Ignore error if old_ipvx file is non existent
* Add docstring for _dyndns_available
* Remove parenthesis otherwise this gonna displease Bram-sama :P
* Start working on postinstall .. use _dyndns_provides to check if domain is a .nohost.me or .nohost.st
* Use _dyndns_available to cleanly check for domain availability
* Forget about the weird 'domain split' check...
* Clean dyndns stuff in domain.py
* Missing argument for string
