Upgrade: log to ipaupgrade.log when IPA server is not installed

Message was printed only to stdout and leaves ipaupgrade.log without any
record that ipa-server-upgrade failed because ipa server is not
installed.
Now error is passed to logger which prints meassage to stderr and
ipaupgrade.log.

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

ipaserver/install/server/upgrade.py

@@ -1650,7 +1650,7 @@ def upgrade_check(options):
     try:
         installutils.check_server_configuration()
     except RuntimeError as e:
-        print(unicode(e))
+        root_logger.error(e)
         sys.exit(1)
 
     if not options.skip_version_check: