Description of problem:

IPA allows creating a user account with numeric name, But sudo doesn't work for
the user.

I have also observed that getent is also not working for the user.

[root@ipa1 ~]# id 2345
uid=923600013(2345) gid=923600013(2345) groups=923600013(2345)
[root@ipa1 ~]# getent passwd 20319
[root@ipa1 ~]#


Version-Release number of selected component (if applicable):

==
[root@ipa1 ~]# rpm -qa ipa-server
ipa-server-4.5.0-22.el7_4.x86_64
==


How reproducible:

yes

Steps to Reproduce:

[root@ipa1 ~]# ipa user-add 1234
First name: 1
Last name: 2
-----------------
Added user "1234"
-----------------
  User login: 1234
  First name: 1
  Last name: 2
  Full name: 1 2
  Display name: 1 2
  Initials: 12
  Home directory: /home/1234
  GECOS: 1 2
  Login shell: /bin/sh
  Principal name: 1234@EX.COM
  Principal alias: 1234@EX.COM
  Email address: 1234@ex.com
  UID: 923600014
  GID: 923600014
  Password: False
  Member of groups: ipausers
  Kerberos keys available: False
[root@ipa1 ~]# id 1234
uid=923600014(1234) gid=923600014(1234) groups=923600014(1234)
[root@ipa1 ~]# getent passwd 1234
[root@ipa1 ~]# getent passwd admin
admin:*:923600000:923600000:Administrator:/home/admin:/bin/bash


Actual results:

Sudo and getent not working