Merge r1666415, r1780308 from trunk:

Small changes to rotatelogs:
- add "-n num" to help text
- clarify in help text, that "program is invoked"
  is the "-p" case
- prevent crash with "-v" (verbose) if no
  "-p prog" is used
- add one space for formatting


rotatelogs: fix -n help text

this closes #24

Submitted By: Isaac Boukris <iboukris gmail.com>


Submitted by: rjung, covener
Reviewed by: rjung, ylavic, niq, jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1828736 13f79535-47bb-0310-9956-ffa450edef68