Add "init" command to control ENGINE
initialization.
Call ENGINE_finish on initialized ENGINEs on exit.
Reorder shutdown in apps.c: modules should be shut
down first.
Add test private key loader to openssl ENGINE: this
just loads a private key in PEM format.
Fix print format for dh length parameter.
to the list using dynamic_path. This stops ENGINEs which
don't supply any default algorithms being automatically
freed (because they have no references) and allows them
to be accessed by id.
Alternative dynamic loading behaviour can be achieved by
issuing the dynamic ENGINE ctrls separately in the config file.
