Improve application role testability

Remove different phases for application role as
those are supposed to run after each other anyway
from playbook and pre/post steps can be disabled
by other means.

Enable Helm override file generation customization by
delegating it to separate role.

Separate Helm file transfer to own module.

NOTE: install.yml with all Helm commands (shell/command)
is not idempotent and should be fixed with separate
commit.

Issue-ID: OOM-1655

Change-Id: Ib29773c4d64a0529c71c3f93c2af7265ae94059f
Signed-off-by: Samuli Silvius <s.silvius@partner.samsung.com>
diff --git a/ansible/roles/application/tasks/custom_role.yml b/ansible/roles/application/tasks/custom_role.yml
new file mode 100644
index 0000000..f0b9a84
--- /dev/null
+++ b/ansible/roles/application/tasks/custom_role.yml
@@ -0,0 +1,8 @@
+---
+# Caller fills application_custom_role variable with actual role name.
+- name: "Execute custom role {{ application_custom_role }} for Helm install."
+  include_role:
+    name: "{{ application_custom_role }}"
+  when:
+    - application_custom_role is defined
+    - application_custom_role is not none