fix datetime log pattern in test_positive_check_installer_logfile

[pondrejk]

result

pytest tests/foreman/installer/test_installer.py::SELinuxTestCase::test_positive_check_installer_logfile -v
===================================================================== test session starts =====================================================================
platform linux -- Python 3.6.6, pytest-4.0.1, py-1.7.0, pluggy-0.8.0 -- /home/pondrejk/Envs/robottelo-py3-master/bin/python3
cachedir: .pytest_cache
shared_function enabled - OFF - scope:  - storage: file
rootdir: /home/pondrejk/Documents/robottelo, inifile:
plugins: services-1.3.0, mock-1.10.0
collecting ... 2018-12-12 17:48:30 - conftest - DEBUG - BZ deselect is disabled in settings

collected 1 item                                                                                                                                              

tests/foreman/installer/test_installer.py::SELinuxTestCase::test_positive_check_installer_logfile PASSED                                                [100%]

================================================================== 1 passed in 16.55 seconds ==================================================================

[codecov]

Codecov Report

Merging #6554 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6554   +/-   ##
=======================================
  Coverage   63.23%   63.23%           
=======================================
  Files          39       39           
  Lines        4352     4352           
=======================================
  Hits         2752     2752           
  Misses       1600     1600

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 55d4a49...0a0ce82. Read the comment docs.

[ldjebran]

ACK