Add ServerAliveInterval option for long running tasks (#839)

Add SSH option (ServerAliveInterval) to keep connection for long running shell tasks (>10 min)

core/src/epicli/data/common/ansible/ansible_inventory.j2

@@ -16,5 +16,9 @@
 [all:vars]
 ansible_user={{ cluster_model.specification.admin_user.name }}
 ansible_ssh_private_key_file={{ cluster_model.specification.admin_user.key_path }}
-# todo: settings of StrictHostKeyChecking from epiphany configuration
+# --- SSH options ---
+# todo: manage StrictHostKeyChecking from Epiphany configuration
+# Always appended to the default command line for sftp, scp, and ssh
 ansible_ssh_common_args='-o StrictHostKeyChecking=no'
+# Always appended to the default ssh command line
+ansible_ssh_extra_args='-o ServerAliveInterval=60 -o ServerAliveCountMax=1'

core/src/epicli/data/common/ansible/playbooks/roles/common/tasks/main.yml

@@ -8,13 +8,9 @@
 
 - include_tasks: "{{ ansible_os_family }}.yml"
 
-- name: Get environment variables
-  command: env
-  register: env_output
-  changed_when: false
-
 - name: Print environment variables
-  debug: msg={{ env_output.stdout_lines }}
+  debug:
+    msg: "{{ ansible_env }}"
 
 - name: Adjust swappiness parameter
   sysctl: