* This broke corner cases when used with
      default_tkt_types = des-cbc-crc
   and DES enabled on an AD domain.
 * This is fixed in kerberos instead, in a more correct way
   and in a way which we cannot replicate.

This will eliminate ambiguity for the AD provider

This function is not supposed to return any newly-allocated memory
directly. It was actually leaking the memory for krb5_servers if
krb5_kdcip was being used, though it was undetectable because it
was allocated on the provided memctx.

This patch removes the memctx parameter and allocates krb5_servers
temporarily on NULL and ensures that it is freed on all exit
conditions. It is not necessary to retain this memory, as
dp_opt_set_string() performs a talloc_strdup onto the appropriate
context internally.

It also updates the DEBUG messages for this function to the
appropriate new macro levels.

 * This is similar to the code in ipa_dyndns_update_send()

Sudo support is optional, when it is not configured sudorules_map is not
initialized and dereferencing it will cause a segmentation fault.

sudoHost attribute may contain IPv4 or IPv6 host/network address.
This patch adds support for autoconfiguration of these information.

Add host information to LDAP filters.

We need to load host information during provider initialization.
Currently it loads only values from configuration files, but it is
implemented as an asynchrounous request as it will later try to
autodetect these settings (which will need to contact DNS).