parametrize backup server side dir

PROD-18191

Change-Id: I15c2cc66f0c0010408863b46c0dccf84730f31d9

README.rst

         backup: true
         initial_data:
           engine: backupninja
+          home_dir: remote-backup-home-dir
           source: backup-node-host
           host: original-salt-master-id
 

salt/files/restore_master.sh

 {%- if master.initial_data is defined %}
 mkdir -p /etc/salt/pki.bak
 mv /etc/salt/pki/* /etc/salt/pki.bak
-scp -r backupninja@{{ master.initial_data.source }}:/srv/backupninja/{{ master.initial_data.host }}/etc/salt/pki/pki.0/* /etc/salt/pki
+scp -r backupninja@{{ master.initial_data.source }}:{{ master.initial_data.get('home_dir', '/srv/backupninja') }}/{{ master.initial_data.host }}/etc/salt/pki/pki.0/* /etc/salt/pki
 {%- if master.pillar.engine == 'reclass' or (master.pillar.engine == 'composite' and master.pillar.reclass is defined) %}
-scp -r backupninja@{{ master.initial_data.source }}:/srv/backupninja/{{ master.initial_data.host }}/srv/salt/reclass/reclass.0/* /srv/salt/reclass
+scp -r backupninja@{{ master.initial_data.source }}:{{ master.initial_data.get('home_dir', '/srv/backupninja') }}/{{ master.initial_data.host }}/srv/salt/reclass/reclass.0/* /srv/salt/reclass
 {%- endif %}
 {%- endif %}