ntpd - remove drop privs

Issues with drop privs, likely due to no useradd and package not adding.
TODO: add ntpd user and group for proper non-root execution.
mysqld - CMD doesnt like vars

According to (https://github.com/docker/docker/issues/5509) cmd does not work with env vars unless entrypoint is calling shell. Due to dictionary usage instead of strings, we get raw mysqld_safe instead of /bin/sh -c ../mysqld_safe. Not a big deal, just needed to be accounted for.
mongodb - remove log forwarding, change cmd args
nrpe - alter cmd args
ldapd - no daemon

Adding debug flag stops slapd from detatching from tty, thus making docker a happy service.