Revision 111554

make sure that modperl's internal post_config callback, which amongst
other things, cloning perl interpreters is running as
modperl_hook_post_config_last APR_HOOK_REALLY_LAST, which ensures that
user's post_config callbacks are run before the cloning. now the code
from config phase's startup.pl can be safely moved to the post_config
phase's equivalent.
- in particular move the contents from modperl_hook_post_config to 
  modperl_hook_post_config_last and eliminate the former
- now can start moving code back to post_config callback from the 
  startup phase