Remove HOTFIX_URL setting and use REPOS_HOSTING_URL instead

[Gauravtalreja1]

HOTFIX_URL is the only setting available in testfm.yaml, which uses @jameerpathan111 FTP to download hotfix-package

@shubhamsg199 Added and deployed hotfix-package package on fedorapeople-fixtures container https://github.com/SatelliteQE/fedorapeople-repos/pull/11 , so moving to use it instead of personal FTP.

Tests Results:

(.testfm) ➜  testfm git:(master) ✗ pytest -q --ansible-host-pattern server --ansible-user=root  --ansible-inventory testfm/inventory tests/test_health.py -k test_positive_check_hotfix_installed
..                                                                                                                                                        [100%]
2 passed, 27 deselected in 441.96 seconds

Dependent MR for satelliteqe-jenkins: MR#524

Signed-off-by: Gaurav Talreja gtalreja@redhat.com