Set nslookup_target in FIPS jobs

FIPS jobs reboot nodes after enabling FIPS,
but unbound service takes some time to
be ready and until then DNS resolution fails.
[1] added support to check DNS is ready after
reboot, in order to utilize it we need to
set "nslookup_target" job var.

[1] https://review.opendev.org/c/zuul/zuul-jobs/+/844704

Closes-Bug: #1978938
Change-Id: Ia39753f7cc533ba9959136b95bc3401d2f34cad4

zuul.d/base.yaml

@@ -140,6 +140,7 @@
     description: |
       Functional testing for a FIPS enabled Centos 8 system
     vars:
+      nslookup_target: 'opendev.org'
       enable_fips: True
       # NOTE(ykarel) Remove MYSQL_GATHER_PERFORMANCE and
       # tox_environment when this job switches to centos-9-stream
@@ -157,6 +158,7 @@
     description: |
       Functional testing for a FIPS enabled Centos 8 system
     vars:
+      nslookup_target: 'opendev.org'
       enable_fips: True
       # NOTE(ykarel) Remove MYSQL_GATHER_PERFORMANCE and
       # tox_environment when this job switches to centos-9-stream

zuul.d/tempest-singlenode.yaml

@@ -609,6 +609,7 @@
       Scenario testing for a FIPS enabled Centos 9 system
     pre-run: playbooks/enable-fips.yaml
     vars:
+      nslookup_target: 'opendev.org'
       configure_swap_size: 4096
       devstack_services:
         br-ex-tcpdump: true
@@ -628,6 +629,7 @@
       Scenario testing for a FIPS enabled Centos 9 system
     pre-run: playbooks/enable-fips.yaml
     vars:
+      nslookup_target: 'opendev.org'
       configure_swap_size: 4096
       devstack_local_conf:
         test-config: