Add 'sysstat' package by default to galera formula

  - Required for disk utilization check in Galera verification pipeline

Related: PROD-28135

Change-Id: I20f603e6bf9e7a34eaa75e5ec63e79433b885c9f
diff --git a/galera/map.jinja b/galera/map.jinja
index 601ae26..6b06dbe 100644
--- a/galera/map.jinja
+++ b/galera/map.jinja
@@ -21,6 +21,7 @@
     - socat
     - libdbd-mysql
     - python-pymysql
+    - sysstat
     service: mysql
     wsrep_provider: /usr/lib/galera/libgalera_smm.so
     log_file: /var/log/mysql.log
@@ -108,6 +109,7 @@
     - socat
     - libdbd-mysql
     - python-pymysql
+    - sysstat
   xenial:
     pkgs:
     - mysql-wsrep-{{ mysql_version }}
@@ -120,6 +122,7 @@
     - socat
     - libdbd-mysql
     - python-pymysql
+    - sysstat
 {%- endload %}
 {%- set _pillar = pillar.galera.get('slave', {}) %}
 {%- if  _pillar|length > 1 %}