Preserve order of servers in ipa-client-install

When multiple servers are passed via --server option, ipadiscovery
module changed its order. Make sure that we preserve it.

Also make sure that user is always warned when a tested server is
not available as then the server will be excluded from the fixed
server list. Log messages were made more informative so that user
knows which server is actually failing to be verified.

https://fedorahosted.org/freeipa/ticket/3418
Avoid multiple client discovery with fixed server list

In client discovery module, we used to run up to three discovery
processes even though we received a fixed list of servers to connect
to. This could result in up to 3 identical "not an IPA server" error
messages when the passed server is not an IPA server.

Error out immediately when we are discovering against a fixed set
of servers.

Related to fixes in https://fedorahosted.org/freeipa/ticket/3418
Enforce exact SID match when adding or modifying a ID range

SID validation in idrange.py now enforces exact match on SIDs, thus
one can no longer use SID of an object in a trusted domain as a
trusted domain SID.

https://fedorahosted.org/freeipa/ticket/3432
Update named.conf parser

Refactor the named.conf parsing and editing functions in bindinstance
so that both "dynamic-db" and "options" sections of named.conf can
be read and updated

https://fedorahosted.org/freeipa/ticket/3429
Use tkey-gssapi-keytab in named.conf

Remove obsolete BIND GSSAPI configuration options tkey-gssapi-credential
and tkey-domain and replace them with tkey-gssapi-keytab which avoids
unnecessary Kerberos checks on BIND startup and can cause issues when
KDC is not available.

Both new and current IPA installations are updated.

https://fedorahosted.org/freeipa/ticket/3429
Do not force named connections on upgrades

We used to set connections argument for bind-dyndb-ldap even when
the attribute was not in named.conf. This is not necessary as
the bind-dyndb-ldap plugin chooses a sane default instead of us.
Improve error messages for external group members

When adding a duplicate member to a group, an error message is issued,
informing the user that the entry is already a member of the group.
Similarly, when trying to delete an entry which is not a member,
an error message is issued, informing the user that the entry is not
a member of the group. These error messages were missing in case of
external members.

This patch also adds support for using the AD\name or name@ad.domain.com
format in ipa group-remove-member command. This format was supported in
group-add-member, but not in group-remove-member.

Unit test file covering these cases was also added.

https://fedorahosted.org/freeipa/ticket/3254
Improve some error handling in ipa-replica-manage

If you break a replica install after the agreement is created but
before it gets much further you'll be in the situation where an
agreement exists, no cn=masters entry exists, and the RUV may not
be set yet.

This adds some error handling so the broken install can be safely
removed.

https://fedorahosted.org/freeipa/ticket/3444
Remove check for alphabetic only characters from domain name validation

The .isalpha() check in validate_domain_name() was too strict,
causing some commands like ipa dnsrecord-add to fail.

https://fedorahosted.org/freeipa/ticket/3385
Fix internal error for ipa show-mappings

The run() method of the show_mappings command was missing
the **options parameter in its signature, causing the
ipa show-mappings to fail with an internal error.
Web UI:Certificate pages

Following pages were added to Web UI:
 * certificated details
 * certificate search

Certificate is not regular object so it gets no metadata. Therefore artificial
metadata were created for it to allow usage of search and details facet.

Search and details facet were modified to allow removing of add/remove/update/
reset buttons - certificates have no mod operation and they are not added by
standard means.

User can revoke and restore certificated in details facet.

https://fedorahosted.org/freeipa/ticket/3419
Web UI:Choose different search option for cert-find

This extends certificate search page by search option select. Therefore
the search is not restricted to 'subject'.

It should be replaced by https://fedorahosted.org/freeipa/ticket/191 in a
future.

https://fedorahosted.org/freeipa/ticket/3419
Realm Domains page

Add support for Realm Domains to web UI.

https://fedorahosted.org/freeipa/ticket/3407