management: Remove create_realm.py.

This no longer does the correct thing (in terms of onboarding emails,
default streams, etc), and is tempting for new server admins to use.

Once we remove it we'll also have the invariant that we can't have a realm
without a user, which will simplify accounts_register a bit.

zerver/management/commands/create_realm.py

@@ -1,72 +0,0 @@
-from __future__ import absolute_import
-from __future__ import print_function
-from optparse import make_option
-
-from typing import Any, Dict, Text
-
-from django.conf import settings
-from django.core.exceptions import ValidationError
-from django.core.management.base import BaseCommand, CommandParser
-from zerver.lib.actions import Realm, do_create_realm, set_default_streams
-from zerver.models import get_realm
-
-import re
-import sys
-
-class Command(BaseCommand):
-    help = """Create a realm.
-
-Usage: ./manage.py create_realm --string_id=acme --name='Acme'"""
-
-    def add_arguments(self, parser):
-        # type: (CommandParser) -> None
-        parser.add_argument('-s', '--string_id',
-                            dest='string_id',
-                            type=str,
-                            help="A short name for the realm. If this "
-                                 "installation uses subdomains, this will be "
-                                 "used as the realm's subdomain.")
-
-        parser.add_argument('-n', '--name',
-                            dest='name',
-                            type=str,
-                            help='The user-visible name for the realm.')
-
-        parser.add_argument('--corporate',
-                            dest='org_type',
-                            action="store_const",
-                            const=Realm.CORPORATE,
-                            default=None,
-                            help='Is a corporate org_type. Is the default.')
-
-        parser.add_argument('--community',
-                            dest='org_type',
-                            action="store_const",
-                            const=Realm.COMMUNITY,
-                            help='Is a community org_type.')
-
-    def handle(self, *args, **options):
-        # type: (*Any, **Any) -> None
-        string_id = options["string_id"]
-        name = options["name"]
-
-        if not name or not string_id:
-            print("\033[1;31mPlease provide a name and string_id.\033[0m\n", file=sys.stderr)
-            self.print_help("./manage.py", "create_realm")
-            exit(1)
-
-        if get_realm(string_id) is not None:
-            raise ValueError("string_id taken. Please choose another one.")
-
-        realm, created = do_create_realm(string_id, name, org_type=options["org_type"])
-        if created:
-            print(string_id, "created.")
-            stream_dict = {
-                "social": {"description": "For socializing", "invite_only": False},
-                "engineering": {"description": "For engineering", "invite_only": False}
-            }  # type: Dict[Text, Dict[Text, Any]]
-            set_default_streams(realm, stream_dict)
-
-            print("\033[1;36mDefault streams set to social,engineering,zulip!\033[0m")
-        else:
-            print(string_id, "already exists.")