[SPARK-4155] Consolidate usages of <driver>

We use "\<driver\>" everywhere. Let's not do that.

Author: Andrew Or <andrew@databricks.com>

Closes #3020 from andrewor14/consolidate-driver and squashes the following commits:

c1c2204 [Andrew Or] Just use "<driver>" for local executor ID
3d751e9 [Andrew Or] Consolidate usages of <driver>
Minor style hot fix after #2711

I had planned to fix this when I merged it but I forgot to. witgo

Author: Andrew Or <andrew@databricks.com>

Closes #3018 from andrewor14/command-utils-style and squashes the following commits:

c2959fb [Andrew Or] Style hot fix
[SPARK-4153][WebUI] Update the sort keys for HistoryPage

Sort "Started", "Completed", "Duration" and "Last Updated" by time.

Author: zsxwing <zsxwing@gmail.com>

Closes #3014 from zsxwing/SPARK-4153 and squashes the following commits:

ec8b9ad [zsxwing] Sort "Started", "Completed", "Duration" and "Last Updated" by time