[2.3] on install MAAS has system warnings

[Mathieu Trudel-Lapierre]

I installed maas from the ppa:maas/next-proposed PPA; as suggested by roaksoax:

<<<<
(installing the maas meta-package)
[...]
  Applying metadataserver.0010_scriptresult_time_and_script_title... OK
  Applying piston3.0002_auto_20151209_1652... OK
  Applying sessions.0001_initial... OK
  Applying sites.0001_initial... OK
  Applying sites.0002_alter_domain_unique... OK
System check identified some issues:

WARNINGS:
?: (urls.W002) Your URL pattern '^/*enlist/(?P<version>[^/]+)/meta-data/(?P<item>.*)$' [name='enlist-metadata-meta-data'] has a regex beginning with a '/'. Remove this slash as it is unnecessary. If this pattern is targeted in an include(), ensure the include() pattern has a trailing '/'.
maas-rackd is a disabled or a static unit not running, not starting it.
Paramétrage de maas-rack-controller (2.3.0~alpha1-6151-g3dd8eed-0ubuntu1~17.10.1) ...
Created symlink /etc/systemd/system/multi-user.target.wants/maas-rackd.service → /lib/systemd/system/maas-rackd.service.
Paramétrage de maas (2.3.0~alpha1-6151-g3dd8eed-0ubuntu1~17.10.1) ...

$ sudo maas createadmin
System check identified some issues:

WARNINGS:
?: (urls.W002) Your URL pattern '^/*enlist/(?P<version>[^/]+)/meta-data/(?P<item>.*)$' [name='enlist-metadata-meta-data'] has a regex beginning with a '/'. Remove this slash as it is unnecessary. If this pattern is targeted in an include(), ensure the include() pattern has a trailing '/'.
[...]
>>>>

I understand this is a pre-release and has not yet made it to the archive, but filing this bug in prevision for the upload: I would expect a formal release of MAAS to install "clean" with no warnings when running 'maas createadmin' or such commands.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.