Added filter plugin lists_mergeby. Fix #249 (#604)

tests/integration/targets/filter_list/aliases

@@ -0,0 +1,2 @@
+shippable/posix/group2
+skip/python2.6  # filters are controller only, and we no longer support Python 2.6 on the controller

tests/integration/targets/filter_list/tasks/main.yml

@@ -0,0 +1,6 @@
+---
+- name: Test lists merged by attribute name
+  assert:
+    that:
+      - "(list1 | community.general.lists_mergeby(list2, 'name') | list |
+          difference(list3) | length) == 0"

tests/integration/targets/filter_list/vars/main.yml

@@ -0,0 +1,22 @@
+list1:
+  - name: myname01
+    param01: myparam01
+  - name: myname02
+    param01: myparam02
+
+list2:
+  - name: myname01
+    param01: myparam03
+  - name: myname02
+    param02: myparam04
+  - name: myname03
+    param03: myparam03
+
+list3:
+  - name: myname01
+    param01: myparam03
+  - name: myname02
+    param01: myparam02
+    param02: myparam04
+  - name: myname03
+    param03: myparam03