KRA: add --setup-kra to ipa-server-install

This patch allows to install KRA on first IPA server in one step using
ipa-server-install

This option improves containers installation where ipa-server can be
installed with KRA using one call without need to call docker exec.

Please note the the original `kra.install()` calls in
ipaserver/install/server/install.py were empty operations as it did
nothing, so it is safe to move them out from CA block

https://pagure.io/freeipa/issue/6731

Reviewed-By: Jan Cholasta <jcholast@redhat.com>
Reviewed-By: Tomas Krizek <tkrizek@redhat.com>

.test_runner_config.yaml

@@ -47,8 +47,7 @@ steps:
   - dnf install -y ${container_working_dir}/dist/rpms/*.rpm --best --allowerasing
   install_server:
   - ipa-server-install -U --domain ${server_domain} --realm ${server_realm} -p ${server_password}
-    -a ${server_password} --setup-dns --auto-forwarders
-  - ipa-kra-install -p ${server_password}
+    -a ${server_password} --setup-dns --setup-kra --auto-forwarders
   lint:
   - PYTHON=/usr/bin/python2 make V=0 lint
   - PYTHON=/usr/bin/python3 make V=0 pylint