If the IPA server is setup with non-matching domain and realm
names, it will not be able to estabilish trust with the Active
Directory.

Adds warnings to the ipa-server-install and warning to the
ipa-adtrust-install (which has to be confirmed).

Man pages for the ipa-server-install and ipa-adtrust-install were
updated with the relevant notes.

https://fedorahosted.org/freeipa/ticket/3924

Enables  support  for  trusted  domains  users  for old clients through Schema
Compatibility plugin.  SSSD supports trusted domains natively starting with
version 1.9 platform. For platforms that lack SSSD or run older SSSD version
one needs  to  use  this  option.  When  enabled, slapi-nis  package  needs  to
be  installed  and schema-compat-plugin will be configured to provide lookup of
users and groups from trusted domains via SSSD on IPA server. These users and
groups will be available under  cn=users,cn=compat,$SUFFIX  and
cn=groups,cn=compat,$SUFFIX trees.  SSSD will normalize names of users and
groups to lower case.

In  addition  to  providing  these users and groups through the compat tree,
this option enables authentication over LDAP for trusted domain users with DN
under compat tree, i.e. using bind DN uid=administrator@ad.domain,cn=users,cn=compat,$SUFFIX.

This authentication  is related to  PAM  stack  using  'system-auth' PAM
service. If you have disabled HBAC rule 'allow_all', then make sure there is
special service called 'system-auth' created and HBAC rule to allow access to
anyone to this rule on IPA masters is added. Please note that system-auth PAM
service is  not used directly by any other application, therefore it is safe to
create one specifically to support trusted domain users via compatibility path.

https://fedorahosted.org/freeipa/ticket/3567

Unattended ipa-adtrust-install used to fail if --netbios option
was not provided. This patches fixes this, so that instead of
failing the default NETBIOS name is used.

https://fedorahosted.org/freeipa/ticket/3497

Remove all unused LDAP-related imports, plus some other ones.

This should make it easier to quickly check what uses which LDAP wrapper

When ipa-adtrust-install is run, check if there are any objects
that need have SID generated. If yes, interactively ask the user
if the sidgen task should be run.

https://fedorahosted.org/freeipa/ticket/3195

Some parts of install scripts used only ccache name as returned by
krbV.CCache.name attribute. However, when this name is used again
to initialize krbV.CCache object or when it is used in KRB5CCNAME
environmental variable, it fails for new DIR type of CCACHE.

We should always use both CCACHE type and name when referring to
them to avoid these crashes. ldap2 backend was also updated to
accept directly krbV.CCache object which contains everything we need
to authenticate with ccache.

https://fedorahosted.org/freeipa/ticket/3381

"Add SIDs for existing users andgroups as the final step" changed
to "Add SIDs for existing users and groups as the final step".

Fixes https://fedorahosted.org/freeipa/ticket/3192

Fixes https://fedorahosted.org/freeipa/ticket/3104

Additionally this patch removes a comment which makes no sense at this
place anymore.

Fixes https://fedorahosted.org/freeipa/ticket/3023