Global DNS configuration is a nice tool to maintain a common DNS
settings stored in LDAP which are then used for all enrolled IPA
servers. However, the settings stored in LDAP override local
settings in named.conf on DNS servers.

This patch adds more information about global DNS configuration
options in install scripts and DNS module help.

https://fedorahosted.org/freeipa/ticket/2525

Server framework calls acutil.res_send() to send DNS queries used
for various DNS tests. However, once acutil is imported it does
not change its list of configured resolvers even when
/etc/resolv.conf is changed. This may lead to unexpected
resolution issues.

We should at least reload httpd when we change /etc/resolv.conf to
point to FreeIPA nameserver to force a new import of acutil and
thus workaround this bug until it is resolved in authconfig.

https://fedorahosted.org/freeipa/ticket/2481

We don't want to run the risk of adding a user, uninstalling it,
the system adding a new user (for another package install for example)
and then re-installing IPA. This wreaks havoc with file and directory
ownership.

https://fedorahosted.org/freeipa/ticket/2423

Admin e-mail validator currently requires an email to be in
a second-level domain (hostmaster@example.com). This is too
restrictive. Top level domain e-mails (hostmaster@testrelm)
should also be allowed.

This patch also fixes default zonemgr value in help texts and man
pages.

https://fedorahosted.org/freeipa/ticket/2272

Add support for autobind to services. This is a bit of a special case
so I currently require the caller to specify ldapi separately. It only
makes sense to do this only in upgrade cases.

Also uninstall ipa_memcached when uninstalling the server.

https://fedorahosted.org/freeipa/ticket/2399

For ssh, VerifyHostKeyDNS option is set to 'yes' if --ssh-trust-dns
ipa-client-install option is used.

For sshd, KerberosAuthentication, GSSAPIAuthentication and UsePAM
options are enabled (this can be disabled using --no-sshd
ipa-client-install option).

ticket 1634

This is done by calling host-mod to update the keys on IPA server and nsupdate
to update DNS SSHFP records. DNS update can be disabled using --no-dns-sshfp
ipa-client-install option.

https://fedorahosted.org/freeipa/ticket/1634

* Adds ipa_memcached SystemV initscript

* Adds ipa_memcached service file and tmpfiles.d/ipa.conf
  to recreate /var/run/ipa_memcached on reboot.

* Adds ipa_memcached config file

* Adds memcacheinstnace.py to manage ipa_memcaced as
  as SimpleService object.

* Updates the IPA service list to include ipa_memcached,
  at service positon 39, httpd is position 40

* Updates the spec file:
  - requires the memcached daemon and python client
  - installs service or initscripts depending on OS
  - installs config file
  - creates /var/run/ipa_memcached directory

* Modifies ipa-server-install to install ipa_memcached

Let ipa-replica-prepare and ipa-replica-install work without
proper DNS records as records in /etc/hosts are sufficient for
DS replication.

  1) ipa-replica-prepare now just checks if the replica hostname
     is resolvable (DNS records are not required). It is now able
     to prepare a replica file even when the replica IP address is
     present in /etc/hosts only.
  2) ipa-replica-install is now able to proceed when the hostname
     is not resolvable. It uses an IP address passed in a new
     option --ip-address to create a record in /etc/hosts in the
     same way as ipa-server-install does.

https://fedorahosted.org/freeipa/ticket/2139

Summarize entered IPA server configuration so that user can examine
it and stop the installation process in case of error. Before this
patch, user had to know which question is the last one and check
the values he entered in various places during the interactive
wizard.

https://fedorahosted.org/freeipa/ticket/1083