Fix for galera bootstrap flag location.

Issue:
  During bootstrap, formula creates file in: /var/lib/mysql
  If galera replica has been broken for any reason, wsrep process
  calls xtrabackup to recover replica and wipes away everything in
  /var/lib/mysql with bootstrap flag as well.
  Now this node is not marked as deployed and galera state rerun
  would try to reprovision it and fail.

Fix:
  Create and check flag in: /etc/mysql/.galera_bootstrap

Prod-Related: PROD-22715
Closes-Bug: PROD-22715
Change-Id: I27db65e1161e22a462dfd273647de4edbe450373

galera/master.sls

   - template: jinja
 
 {%- if salt['cmd.shell']('test -e /var/lib/mysql/.galera_bootstrap; echo $?') != '0'  %}
+{%- if salt['cmd.shell']('test -e /etc/salt/.galera_bootstrap; echo $?') != '0'  %}
 
 # Enforce config before package installation
 galera_pre_config:
 
 galera_bootstrap_finish_flag:
   file.touch:
-  - name: /var/lib/mysql/.galera_bootstrap
+  - name: /etc/salt/.galera_bootstrap
   - require:
     - cmd: galera_bootstrap_start_service_final
   - watch_in:
   {%- endif %}
 
 {%- endif %}
+{%- endif %}

galera/slave.sls

   - template: jinja
 
 {%- if salt['cmd.shell']('test -e /var/lib/mysql/.galera_bootstrap; echo $?') != '0'  %}
+{%- if salt['cmd.shell']('test -e /etc/salt/.galera_bootstrap; echo $?') != '0'  %}
 
 # Enforce config before package installation
 galera_pre_config:
 
 galera_bootstrap_finish_flag:
   file.touch:
-  - name: /var/lib/mysql/.galera_bootstrap
+  - name: /etc/salt/.galera_bootstrap
   - require:
     - cmd: galera_bootstrap_start_service_final
   - watch_in:
   {%- endif %}
 
 {%- endif %}
+{%- endif %}