isis: T4337: IETF SPF delay algorithm can not be configured

To reproduce:

set protocols isis interface eth1
set protocols isis net '49.0001.1921.6800.1002.00'

Now enable SPF:

set protocols isis spf-delay-ietf holddown '20'
set protocols isis spf-delay-ietf init-delay '31'
set protocols isis spf-delay-ietf long-delay '30'
set protocols isis spf-delay-ietf short-delay '32'
set protocols isis spf-delay-ietf time-to-learn '44'

This will only render the FRR config line: spf-delay-ietf init-delay 31 which
is incomplete:

frr-reload output:   2 2022-04-03 12:35:24,764   ERROR: vtysh failed to process new configuration: vtysh (mark file) exited with status 4:
frr-reload output:   3 b'line 15: % Command incomplete:  spf-delay-ietf init-delay 31\n\n'

1 files changed, 2 insertions, 2 deletions

diff --git a/data/templates/frr/isisd.frr.tmpl b/data/templates/frr/isisd.frr.tmpl
index 6cfa076d0..40c7f8aa1 100644
--- a/data/templates/frr/isisd.frr.tmpl
+++ b/data/templates/frr/isisd.frr.tmpl
@@ -99,8 +99,8 @@ router isis VyOS {{ 'vrf ' + vrf if vrf is defined and vrf is not none }}
 {%     endfor %}
 {%   endif %}
 {% endif %}
-{% if spf_delay_ietf is defined and spf_delay_ietf.init_delay is defined and spf_delay_ietf.init_delay is not none %}
- spf-delay-ietf init-delay {{ spf_delay_ietf.init_delay }}
+{% if spf_delay_ietf is defined and spf_delay_ietf.init_delay is defined and spf_delay_ietf.short_delay is defined and spf_delay_ietf.long_delay is defined and spf_delay_ietf.holddown is defined and spf_delay_ietf.time_to_learn is defined %}
+ spf-delay-ietf init-delay {{ spf_delay_ietf.init_delay }} short-delay {{ spf_delay_ietf.short_delay }} long-delay {{ spf_delay_ietf.long_delay }} holddown {{ spf_delay_ietf.holddown }} time-to-learn {{ spf_delay_ietf.time_to_learn }}
 {% endif %}
 {% if area_password is defined and area_password is not none %}
 {%   if area_password.md5 is defined and area_password.md5 is not none %}