[freeipa PR#3317][opened] ipatest: check if /var/log is not present in error message of ipa backup

[miskopo]

   URL: https://github.com/freeipa/freeipa/pull/3317
Author: miskopo
 Title: #3317: ipatest: check if /var/log is not present in error message of ipa backup
Action: opened

PR body:
"""
Pagure#6843 - Implemented test for ipa backup fail message mentioning log even in case
no log was created. After ipa-server package is installed, ipa backup is
executed without prior server-install. ipa backup fails and error
message should not contain mention of /var/log as no log was created.

Signed-off-by: Michal Polovka <mpolovka(a)redhat.com&gt;
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/3317/head:pr3317
git checkout pr3317