Config: allow to set group for user

According to recent IRC discussions is could be useful for haclient.
Partial-Bug: #1934753

Change-Id: I670fa84476e35e55cbed2d22e48836ed5e28495f

docker/base/Dockerfile.j2

@@ -21,7 +21,7 @@ ENV LANG en_US.UTF-8
 {# Specifics required such as homedir or shell are configured within the service specific image #}
 {%- for name, user in users | dictsort() %}
 {% if loop.first -%}RUN {% else %}    && {% endif -%}
-    groupadd --force --gid {{ user.gid }} {{ name }} \
+    groupadd --force --gid {{ user.gid }} {{ user.group }} \
     && useradd -l -M --shell /usr/sbin/nologin --uid {{ user.uid }} --gid {{ user.gid }} {{ name }}
         {%- if not loop.last %} \{% endif -%}
 {%- endfor %}

kolla/common/config.py

@@ -954,10 +954,11 @@ def get_source_opts(type_=None, location=None, reference=None):
                              'or branch name'))]
 
 
-def get_user_opts(uid, gid):
+def get_user_opts(uid, gid, group):
     return [
         cfg.IntOpt('uid', default=uid, help='The user id'),
         cfg.IntOpt('gid', default=gid, help='The group id'),
+        cfg.StrOpt('group', default=group, help='The group name'),
     ]
 
 
@@ -965,7 +966,11 @@ def gen_all_user_opts():
     for name, params in USERS.items():
         uid = params['uid']
         gid = params['gid']
-        yield name, get_user_opts(uid, gid)
+        try:
+            group = params['group']
+        except KeyError:
+            group = name[:-5]
+        yield name, get_user_opts(uid, gid, group)
 
 
 def gen_all_source_opts():

kolla/image/build.py

@@ -852,6 +852,7 @@ class KollaWorker(object):
                 ret[match.group(0)[:-5]] = {
                     'uid': user.uid,
                     'gid': user.gid,
+                    'group': user.group,
                 }
         return ret
 

releasenotes/notes/set-group-for-user-aa9b3eae69d8f6a0.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Allow to set group for user.