various fix on ssl/tls + tests ...

* making ssl cert check and cert no check works
* adding a test to check if the cafile does exist
* reenable and fix ssl checks on travis

fix error if no ppolicy module

implementing ppolicy handling and a simple ppolicy module

implementing a simple ppolicy module

initialize ppolicy module

implementing frontend password policy check

adding skeleton for ppolicy check

fix error if password is not in modified attributes

change where form parsing is executed ...

this change creates a cleaner api for core functions

better exception handling in ldap backend

factoring source code

better docstring and splitting template load from reload

disable redirection + disable selfmodify if authentication is 'none'

fix unicode

adding redirect to selfmodify on /

implementing selfmodify

make the key attribute not modifiable in modify form

implementing modify

better log handler

replace uppercase characters in logs

adding another debug log

prefixing all form attributes to differenciate between types

redirecting to the edit page once submit modify

implementing deletion of a user

implementing backend method for delete user

fix adding multiple time to same group + logs

code reorganization + logs ...

* adding logs when adding users
* move adduser with other none exposed classes
* skeleton for modify and delete user

better logs

implementing displaying roles and standalone groups in modify form

begin implementing modify user form