The scheduler no longer logs pages as they are printed, instead just logging

The scheduler no longer logs pages as they are printed, instead just logging
a total of the pages printed at job completion (Issue #4991)

- man/cupsd-logs.man: Update page_log information.
- scheduler/job.c: Move cupsdLogPage to finalize_job, make update_job only
  accept a "PAGE: total NNN" message if the count is greater than the total
  cupsd already has. Also track sheets.
- test/run-stp-tests.sh: Fix page log verification for Test3 since we now just
  have the total lines.