DCD-386: Rework product_startup to support more systemd params and add tests for some corner cases.

roles/product_startup/molecule/bitbucket/playbook.yml

@@ -0,0 +1,28 @@
+---
+- name: Converge
+  hosts: all
+  vars:
+    atl_product_user: "bitbucket"
+    atl_product_family: "stash"
+    atl_product_edition: "bitbucket"
+
+    atl_startup_systemd_params:
+      - "UMask=0027"
+      - "LimitNOFILE=4096"
+      - "Environment=BITBUCKET_HOME={{ atl_product_home_shared }}"
+
+    atl_startup_exec_options:
+      - "-fg"
+      - "--no-search"
+
+    atl_startup_enable: false
+    atl_startup_restart: false
+
+  pre_tasks:
+    - name: Create systemd dir if necessary
+      file:
+        path: '/etc/systemd/system/'
+        state: directory
+    
+  roles:
+    - role: product_startup