tctl users ls returning duplicates

[bharadwajrembar]

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What happened: When querying for a list of users using tctl users ls, each user is listed 3 times.

What you expected to happen: Each user must be listed once

How to reproduce it (as minimally and precisely as possible): This seems to occur when we upgraded Teleport from 2.7.0 to 3.1.1.

Environment:

• Teleport version (use teleport version): Teleport v3.1.1 git:v3.1.1-0-g8c506f47 go1.11.4
• Tsh version (use tsh version): Teleport v3.1.1 git:v3.1.1-0-g8c506f47 go1.11.4
• OS (e.g. from /etc/os-release): Ubuntu 16.04

Browser environment

• Browser Version (for UI-related issues):
• Install tools:
• Others:

Relevant Debug Logs If Applicable
tctl users ls --debug

DEBU             DEBUG logging enabled common/tctl.go:188
DEBU [BACKEND:D] Found new flat keyspace, skipping migration. dir:/var/lib/teleport/proc dir/migrate.go:42
User               Allowed logins
------------------ -------------------------------------------------
user1 user1
user1 user1
user1 user1
user2   docker,user2
user2   docker,user2
user2   docker,user2
user3   docker,user3
user3   docker,user3
user3   docker,user3

Further reference: #2107

• tsh --debug
• teleport --debug

[klizhentas]

dupe of reopened #2107