result file should follow rhcert naming convention

[goneri]

RHCert-UI will refuse any file that does not match their naming convention: ^rhcert-results-(?P<hostname>.+)-(?P<date>[0-9]+)\.xml(.gz)?$

Quoting Anshul:

         There is an ansible job[1] in playbook that is compressing the results.xml
         to gz format, this can be done via #rhcert-cli save command, save command
         will then save the file in required format and then you can download the
         same file (location in the output of command) to the required system.

         I am attaching a sample output of the same command below.

         [root@hp-dl60g9-1 ~]# rhcert-cli save
         Saving current results to:
         /var/www/rhcert/store/HP/ProLiant/ProLiant DL60
         Gen9/x86_64/RHEL/7.4/rhcert-results-hp-dl60g9-1.gsslab.pnq.redhat.com-20180112090115.xml.gz
         Saving to server 10.10.85.40
         sending file /var/www/rhcert/store/HP/ProLiant/ProLiant DL60
         Gen9/x86_64/RHEL/7.4/rhcert-results-hp-dl60g9-1.gsslab.pnq.redhat.com-20180112090115.xml.gz
         response:
         Saving File From IP: 10.65.200.175
         To:
         /certification/openstack/31095/hp-dl60g9-1.gsslab.pnq.redhat.com/2018-01-12
         09:01:14/assign
         Upload took 1.21 seconds, 0.05 MB/sec

         Highlighted line has the location of the file in correct format on the
         system under test, your playbooks can be changed accordingly.
         Let me know if you need more information

[goneri]

The issue on the redhat-certification BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1539927