Move config directives handling code

Move config directives handling code:
        ipaserver.install.installutils -> ipapython.directivesetter

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

ipaserver/install/krainstance.py

@@ -34,6 +34,7 @@ from six.moves.configparser import RawConfigParser
 from ipalib import api
 from ipalib import x509
 from ipaplatform.paths import paths
+from ipapython import directivesetter
 from ipapython import ipautil
 from ipapython.dn import DN
 from ipaserver.install import cainstance
@@ -362,7 +363,7 @@ class KRAInstance(DogtagInstance):
         write operations.
         """
         with installutils.stopped_service('pki-tomcatd', 'pki-tomcat'):
-            installutils.set_directive(
+            directivesetter.set_directive(
                 self.config,
                 'kra.ephemeralRequests',
                 'true', quotes=False, separator='=')