Fix a number of different typos across the code base

Note these are only valid for debug output, not syslog

Since it's already checked for error

Delete ancient cruft relating to libraries that haven't existed since OpenSSL 0.9.x

No need to reschedule the task inside asyncmeta_timeout_loop.
Frontend already does it if task was init'd with a valid interval.

Add libevent to the product list

Rename slapd/config.h to slap-config.h and update accordingly
Rename lloadd/config.h to lload-config.h and update accordingly