All SELinux policy needed by FreeIPA server is now part of the global
system SELinux policy which makes the subpackage redundant and slowing
down the installation. This patch drops it.

https://fedorahosted.org/freeipa/ticket/3683
https://fedorahosted.org/freeipa/ticket/3684

Incorporate SELinux policy changes introduced in Dogtag 10 in IPA
SELinux policy:
- dogtag10 now runs with pki_tomcat_t context instead of pki_ca_t
- certmonger related rule are now integrated in system policy and
  can be removed from IPA policy

Also remove redundant SELinux rules for connection of httpd_t, krb5kdc_t
or named_t to DS socket. The socket has different target type anyway
(dirsrv_var_run_t) and the policy allowing this is already in
system.

https://fedorahosted.org/freeipa/ticket/3234

This also removes the Index option of /ipa-assets as well as the
deprecated IPADebug option.

No need to build or install ipa_webgui anymore. Leaving in the code
for reference purposes for now.

External CA signing is a 2-step process. You first have to run the IPA
installer which will generate a CSR. You pass this CSR to your external
CA and get back a cert. You then pass this cert and the CA cert and
re-run the installer. The CSR is always written to /root/ipa.csr.

A run would look like:

 # ipa-server-install --ca --external-ca -p password -a password -r EXAMPLE.COM -u dirsrv -n example.com --hostname=ipa.example.com -U
[ sign cert request ]
 # ipa-server-install --ca --external-ca -p password -a password --external_cert_file=/tmp/rob.crt --external_ca_file=/tmp/cacert.crt  -U -p password -a password -r EXAMPLE.COM -u dirsrv -n example.com --hostname=ipa.example.com

This also abstracts out the RA backend plugin so the self-signed CA we
create can be used in a running server. This means that the cert plugin
can request certs (and nothing else). This should let us do online replica
creation.

To handle the self-signed CA the simple ca_serialno file now contains
additional data so we don't have overlapping serial numbers in replicas.
This isn't used yet. Currently the cert plugin will not work on self-signed
replicas.

One very important change for self-signed CAs is that the CA is no longer
held in the DS database. It is now in the Apache database.

Lots of general fixes were also made in ipaserver.install.certs including:
 - better handling when multiple CA certificates are in a single file
 - A temporary directory for request certs is not always created when the
   class is instantiated (you have to call setup_cert_request())

ldapi: grants httpd and krb5kdc to access the DS ldapi socket

ctypes: the Python uuid module includes ctypes which makes httpd segfault
due to SELinux problems.

dogtag: remove the CRL publishing permissions. This only worked if you
had dogtag installed. In the near future will publish elsewhere so for
the time being CRL file publishing will be broken with SELinux enabled.