Set bigger swap in the functional and fullstack jobs

As we are hitting some memory limits (again) in functional tests
job, lets configure 8GB of swap in all functional and fullstack jobs.

Before that patch swap was configured to 4GB only in the FIPS jobs. Now
it will be set to 8GB in all functional and fullstack jobs.

Closes-Bug: #1966394

Change-Id: I6b097d8409318a5dfe17e9673adb6c1431a59b0b

zuul.d/base.yaml

@@ -34,6 +34,7 @@
       - ^rally-jobs/.*$
       - ^zuul.d/(?!(project)).*\.yaml
     vars:
+      configure_swap_size: 8192
       Q_BUILD_OVS_FROM_GIT: True
       INSTALL_OVN: True
       OVN_BRANCH: v21.06.0
@@ -140,7 +141,6 @@
       Functional testing for a FIPS enabled Centos 8 system
     vars:
       enable_fips: True
-      configure_swap_size: 4096
       devstack_localrc:
         ISCSI_CHAP_ALGORITHMS: SHA3-256,SHA256
         Q_BUILD_OVS_FROM_GIT: true
@@ -153,7 +153,6 @@
       Functional testing for a FIPS enabled Centos 8 system
     vars:
       enable_fips: True
-      configure_swap_size: 4096
       devstack_localrc:
         ISCSI_CHAP_ALGORITHMS: SHA3-256,SHA256
         Q_BUILD_OVS_FROM_GIT: true