Rework inventory all by real groups' vars

* Leave all.yml to keep only optional vars
* Store groups' specific vars by existing group names
* Fix optional vars casted as mandatory (add default())
* Fix missing defaults for an optional IP var
* Relink group_vars for terraform to reflect changes

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

roles/kubernetes-apps/kpm/tasks/main.yml

@@ -4,7 +4,7 @@
     name: "kpm"
     state: "present"
     version: "0.16.1"
-  when: kpm_packages | length > 0
+  when: kpm_packages|default([])| length > 0
 
 - name: manage kubernetes applications
   kpm:
@@ -14,7 +14,7 @@
     version: "{{item.version | default(omit)}}"
     variables: "{{item.variables | default(omit)}}"
     name: "{{item.name}}"
-  with_items: "{{kpm_packages}}"
+  with_items: "{{kpm_packages|default([])}}"
   register: kpmresults
   environment:
     PATH: "{{ ansible_env.PATH }}:{{ bin_dir }}"