One of these changes appears to have possibly introduced a serious
performance regression in the master pipeline. To avoid destabilizing
work over the weekend, I'm reverting for now and we can investigate more
fully next week.

This reverts the following commits:
"gprecoverseg: Show progress of pg_basebackup on each segment"
    1b38c6e8
"Add gprecoverseg -s to show progress sequentially"
    9e89b5ad
"gpinitstandby: guide the user on single-host systems"
    c9c3c351
"gpinitstandby: rename -F to -S and document it"
    ba3eb5b4