WFLY-2985 Simple implementation of view/download server logs from CLI GUI.
Download 5K lines at a time to save server memory.
Add progress dialog for log downloads.
After download, view in default log viewer.
Only show 'Download complete' if open in viewer not supported on OS.
Merge pull request #5940 from ssilvert/cli-gui-logs

WFLY-2985 Simple implementation of view/download server logs from CLI GU...