Increase the timeout waiting for certificate issuance in installer

During the server installation, the installer requests certificates
through certmonger. The current timeout is 60s and is too low.
Increase this timeout to api.env.startup_timeout as done in
ipa_cacert_manage or ipa_certupdate.py
(the code checks the status each 5s up to the timeout value).

https://fedorahosted.org/freeipa/ticket/6433

Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>

ipalib/install/certmonger.py

@@ -30,6 +30,7 @@ import dbus
 import shlex
 import subprocess
 import tempfile
+from ipalib import api
 from ipapython.ipa_log_manager import root_logger
 from ipaplatform.paths import paths
 from ipaplatform import services
@@ -309,7 +310,7 @@ def request_and_wait_for_cert(
     reqId = request_cert(nssdb, nickname, subject, principal,
                          passwd_fname, dns, ca, profile,
                          pre_command, post_command)
-    state = wait_for_request(reqId, timeout=60)
+    state = wait_for_request(reqId, api.env.startup_timeout)
     ca_error = get_request_value(reqId, 'ca-error')
     if state != 'MONITORING' or ca_error:
         raise RuntimeError("Certificate issuance failed ({})".format(state))