Fix NTP server configuration

This fix is to make sure the list of NTP servers stored in session
reflects the reality of webui, i.e. order of servers entered + blank
fields. The "empty" servers are then removed from the list just
before the configuration is to be saved (commited into DB).

https://bugzilla.redhat.com/show_bug.cgi?id=1153633
Fixed SlickGrid issue not rendering rows in Production mode

This is another instance of this issue that was initially corrected in commit a2c8d29c4d92e7bcab798edf7cb195cb0c4fb187

https://bugzilla.redhat.com/show_bug.cgi?id=1155605
https://bugzilla.redhat.com/show_bug.cgi?id=1156127
Merge pull request #918 from bmclaughlin/slickgrid-issue-in-production-mode

Fixed SlickGrid issue not rendering rows in Production mode
Merge pull request #897 from mzazrivec/fix_ntp_server_configuration

Fix NTP server configuration
Remove caching of file names preventing new file uploads

Ensure zip is always required
Change logging of LogFile record name to file name
https://bugzilla.redhat.com/show_bug.cgi?id=1151163
Merge pull request #923 from brandondunne/clarify_file_name_logging_on_log_collection

Remove caching of file names preventing new file uploads