[freeipa PR#1124][opened] [Backport][ipa-4-5] Change Travis CI container to FreeIPA-owned

[Tiboris]

   URL: https://github.com/freeipa/freeipa/pull/1124
Author: Tiboris
 Title: #1124: [Backport][ipa-4-5] Change Travis CI container to FreeIPA-owned
Action: opened

PR body:
"""
Backport commit 79d9bdcec388b5b21b46fcb5a35d93d5b246ace2 from PR #1055 to ipa-4-5 branch

Needed by PR #1123
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/1124/head:pr1124
git checkout pr1124