MFC 295930:

MFC 295930:
Add support for displaying thread IDs to truss(1).

- Consolidate duplicate code for printing the metadata at the start of
  each line into a shared function.
- Add an -H option which will log the thread ID of the relevant thread
  for each event.

While here, remove some extraneous calls to clock_gettime() in
print_syscall() and print_syscall_ret().  The caller of print_syscall_ret()
always updates the current thread's "after" time before it is called.

git-svn-id: svn://svn.freebsd.org/base/stable/10@298427 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f