[change] New parameter "use_tls" for LDAP settings in list config, datasources and auth.conf.  Obsoleted parameters "use_ssl" and "use_start_tls" still can be used.

"use_tls" takes one of following values corresponding to old ones:
- "starttls" : use_ssl=0, use_start_tls=1.
- "ldaps"    : use_ssl=1, use_start_tls=0.
- "none"     : TLS/SSL is disabled.

[feature] Now STARTTLS may be enabled in LDAP datasource configuration of lists along with LDAPS.


git-svn-id: https://subversion.renater.fr/sympa/branches/sympa-6.2-branch@12772 05aa8bb8-cd2b-0410-b1d7-8918dfa770ce