[Bug 1797944] [NEW] sudoers entries with FQDN are ignored on Ubuntu 14.04

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Here is the short example of /etc/sudoers in order to reproduce the issue that if host is defined as FQDN then such string is skipped on Ubuntu 14.04. The following sudo is installed on the host "1.8.9p5-1ubuntu1.4  amd64"
~~~~~~~~~~~~~
~# cat /etc/sudoers
Defaults        syslog=local3
Defaults        !set_home
Defaults        !targetpw
Defaults        !insults
Defaults        mailto=alert-sudo
Defaults        !mail_always
Defaults        ignore_dot
Defaults        timestamp_timeout=5
Defaults        listpw=always
Defaults        !lecture_file

Defaults        fqdn

user1      host1.xxx.yyyy.com = (root) /bin/true
user1      host1 = (root) /bin/false
~~~~~~~~~~~~~
~$ sudo -l -U ovgumeny
Matching Defaults entries for ovgumeny on fmyuranch01:
    syslog=local3, !set_home, !targetpw, !insults, mailto=alert-sudo, !mail_always, ignore_dot,
    timestamp_timeout=5, listpw=always, !lecture_file, fqdn

User user1 may run the following commands on host1:
    (root) /bin/false
~~~~~~~~~~~~~
~$ hostname
host1
~$ hostname -f
host1.xxx.yyyy.com
~~~~~~~~~~~~~
~# lsb_release  -d
Description:    Ubuntu 14.04.5 LTS
~~~~~~~~~~~~~

** Affects: sudo (Ubuntu)
     Importance: Undecided
         Status: New

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sudoers entries with FQDN are ignored on Ubuntu 14.04 
https://bugs.launchpad.net/bugs/1797944
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