Bump lv_audit LVM size to 500MB for CI-AIO

Rebooting from Ubuntu upgrade creates audit.log file that uses all of
lv_audit partition.
Doubling its size to avoid having LowDiskSpace from SCT.

Author: seunghun1ee

etc/kayobe/environments/ci-aio/inventory/group_vars/controllers/lvm.yml

@@ -25,7 +25,7 @@ stackhpc_lvm_lv_var_tmp_size: 2g
 stackhpc_lvm_lv_log_size: 2g
 
 # StackHPC LVM lv_audit LV size.
-stackhpc_lvm_lv_audit_size: 250m
+stackhpc_lvm_lv_audit_size: 500m
 
 # StackHPC LVM lv_home LV size.
 stackhpc_lvm_lv_home_size: 2g