Implement tail -F, which is the same as supplying both -f and --retry

[fitzgen]

From tail's man page:

       -F     same as --follow=name --retry

Depends on #847 to implement --retry.

[mrmiywj]

@fitzgen
Hi, I read through the man page, it shows that --follow is allowed to be with name or descriptor, which means different ways to print the file. But our implementation, it looks like only descriptor mode is supported, which is not compatible with --retry.
I do think name and descriptor modes should be separated.
You can find the specificatio here

[mrmiywj]

Hmm, actually the files' metadata API is unstable now, is there any solution to know whether the file changes or not?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.