Rock-on install back-end - add per-container env info rockstor#1588

Add back-end container dimension awareness re environment
passed from Rock-on install wizard. Rebase of earlier work
cheery picked/re-based from anatox's prior work on GitHub.

src/rockstor/storageadmin/views/rockon_id.py

@@ -111,6 +111,7 @@ def post(self, request, rid, command):
                 )
                 containers = DContainer.objects.filter(rockon=rockon)
                 for co in containers:
+                    co_id = str(co.id)
                     for sname in share_map.keys():
                         dest_dir = share_map[sname]
                         if not Share.objects.filter(name=sname).exists():
@@ -177,15 +178,16 @@ def post(self, request, rid, command):
                         cco = DCustomConfig.objects.get(rockon=rockon, key=c)
                         cco.val = cc_map[c]
                         cco.save()
-                    for e in env_map.keys():
-                        if not DContainerEnv.objects.filter(
-                            container=co, key=e
-                        ).exists():
-                            e_msg = ("Invalid environment variable ({}).").format(e)
-                            handle_exception(Exception(e_msg), request)
-                        ceo = DContainerEnv.objects.get(container=co, key=e)
-                        ceo.val = env_map[e]
-                        ceo.save()
+                    if co_id in env_map:
+                        for e in env_map[co_id].keys():
+                            if not DContainerEnv.objects.filter(
+                                container=co, key=e
+                            ).exists():
+                                e_msg = ("Invalid environment variable ({}).").format(e)
+                                handle_exception(Exception(e_msg), request)
+                            ceo = DContainerEnv.objects.get(container=co, key=e)
+                            ceo.val = env_map[co_id][e]
+                            ceo.save()
                 task_result_handle = install(rockon.id)
                 rockon.taskid = task_result_handle.id
                 rockon.state = "pending_install"