krb5conf: use 'true' instead of 'yes' for forwardable option

'yes' is also valid value in krb5.conf but we should be consistent and
use only 'true' as we do for other options.

https://fedorahosted.org/freeipa/ticket/5518

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

client/ipa-client-install

@@ -1069,7 +1069,7 @@ def configure_krb5_conf(cli_realm, cli_domain, cli_server, cli_kdc, dnsok,
         libopts.append({'name':'dns_lookup_kdc', 'type':'option', 'value':'true'})
     libopts.append({'name':'rdns', 'type':'option', 'value':'false'})
     libopts.append({'name':'ticket_lifetime', 'type':'option', 'value':'24h'})
-    libopts.append({'name':'forwardable', 'type':'option', 'value':'yes'})
+    libopts.append({'name':'forwardable', 'type':'option', 'value':'true'})
     libopts.append({'name':'udp_preference_limit', 'type':'option', 'value':'0'})
 
     # Configure KEYRING CCACHE if supported

install/share/krb5.conf.template

@@ -11,7 +11,7 @@ includedir /var/lib/sss/pubconf/krb5.include.d/
  dns_lookup_kdc = true
  rdns = false
  ticket_lifetime = 24h
- forwardable = yes
+ forwardable = true
  udp_preference_limit = 0
 $OTHER_LIBDEFAULTS
 [realms]

install/tools/ipa-replica-conncheck

@@ -249,7 +249,7 @@ def configure_krb5_conf(realm, kdc, filename):
     libdefaults.append({'name':'dns_lookup_kdc', 'type':'option', 'value':'true'})
     libdefaults.append({'name':'rdns', 'type':'option', 'value':'false'})
     libdefaults.append({'name':'ticket_lifetime', 'type':'option', 'value':'24h'})
-    libdefaults.append({'name':'forwardable', 'type':'option', 'value':'yes'})
+    libdefaults.append({'name':'forwardable', 'type':'option', 'value':'true'})
     libdefaults.append({'name':'udp_preference_limit', 'type':'option', 'value':'0'})
 
     opts.append({'name':'libdefaults', 'type':'section', 'value': libdefaults})