Add var to append to exclude list

The review adds a new variable called artcl_exclude_list_append
which can be set to extra exclude paths artcl_exclude_list will
be extended about.

Change-Id: I1d104647447d63b993550e7c24e4e5262cb93632

README.rst

@@ -49,6 +49,9 @@ Collection related
    from collecting. This list is passed to rsync as an exclude filter
    and it takes precedence over the collection list. For details see the
    “FILTER RULES” topic in the rsync man page.
+-  ``artcl_exclude_list_append`` – A list of files and directories to be
+   appended in the default exclude list. This is useful for users that want to
+   keep the original list and just add more relevant paths.
 -  ``artcl_collect_dir`` – A local directory where the logs should be
    gathered, without a trailing slash.
 -  ``collect_log_types`` - A list of which type of logs will be collected,

infrared_plugin/plugin.spec

@@ -45,6 +45,12 @@ subparsers:
               list is passed to rsync as an exclude filter and it takes
               precedence over the collection list. For details see the
               “FILTER RULES” topic in the rsync man page.
+          artcl_exclude_list_append:
+            type: ListValue
+            help: |
+              A list of files and directories to be appended in the default
+              exclude list. This is useful for users that want to keep the
+              original list and just add more relevant paths.
           local_working_dir:
             type: Value
             help: |

tasks/collect.yml

@@ -45,6 +45,10 @@
     - artcl_collect_override is defined
     - artcl_collect_override[inventory_hostname] is defined
 
+- name: Set default exclude list
+  set_fact:
+    artcl_exclude_list: "{{ artcl_exclude_list|default([]) }} + {{ artcl_exclude_list_append|default([]) }}"
+
 - name: Create temp directory before gathering logs
   file:
     dest: "/tmp/{{ inventory_hostname }}"