server upgrade: always upgrade KRA agent PEM file

Before the KRA agent PEM file is exported in server upgrade, the sysupgrade
state file is consulted. This causes the KRA agent PEM file not to be
exported to the new location if the upgrade was executed in the past.

Do not consult the sysupgrade state file to decide whether to upgrade the
KRA agent PEM file or not, the existence of the file is enough to make this
decision.

https://fedorahosted.org/freeipa/ticket/6675

Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>

ipaplatform/base/paths.py

@@ -39,6 +39,7 @@ class BasePathNamespace(object):
     HOSTS = "/etc/hosts"
     ETC_HTTPD_DIR = "/etc/httpd"
     HTTPD_ALIAS_DIR = "/etc/httpd/alias"
+    OLD_KRA_AGENT_PEM = "/etc/httpd/alias/kra-agent.pem"
     IPA_RADB_DIR = "/var/lib/ipa/radb"
     HTTPD_CONF_D_DIR = "/etc/httpd/conf.d/"
     HTTPD_IPA_KDCPROXY_CONF = "/etc/ipa/kdcproxy/ipa-kdc-proxy.conf"