Simplify definition of fips jobs

With the new base jobs, it is no longer necessary to define a pre-run
playbook.  You simply need to set enable_fips to True and specify an
nslookup_target.  This will set things up to use ubuntu jobs when FIPS
is supported on jammy

Depends-On: https://review.opendev.org/c/openstack/devstack/+/871606
Change-Id: I1c02c4817a39d26e94873831801089d1aa86133c

playbooks/enable-fips.yaml

@@ -1,4 +0,0 @@
-- hosts: all
-  tasks:
-    - include_role:
-        name: enable-fips

zuul.d/integrated-gate.yaml

@@ -342,11 +342,11 @@
     description: |
       Integration testing for a FIPS enabled Centos 8 system
     nodeset: devstack-single-node-centos-8-stream
-    pre-run: playbooks/enable-fips.yaml
     vars:
       tox_envlist: full
       configure_swap_size: 4096
       nslookup_target: 'opendev.org'
+      enable_fips: True
 
 - job:
     name: tempest-centos9-stream-fips
@@ -355,11 +355,11 @@
       Integration testing for a FIPS enabled Centos 9 system
     timeout: 10800
     nodeset: devstack-single-node-centos-9-stream
-    pre-run: playbooks/enable-fips.yaml
     vars:
       tox_envlist: full
       configure_swap_size: 4096
       nslookup_target: 'opendev.org'
+      enable_fips: True
 
 - job:
     name: tempest-pg-full