Update postprocess and boot for debian

Add required postprocess steps and boot commands in debian templates

Signed-off-by: Milosz Wasilewski <milosz.wasilewski@oss.qualcomm.com>

Author: mwasilew

lava_test_plans/projects/qcom-deb-images/flasher.jinja2

@@ -19,3 +19,12 @@ metadata:
   lava_test_results_dir: /home/lava-%s
   test_character_delay: 10
 {% endblock context %}
+
+{% block auto_login_commands %}
+      login_commands:
+        - "debian"
+        - "new password"
+        - "new password"
+        - sudo su
+{% endblock auto_login_commands %}
+