Refactor drone yml

[phil-davis]

1. Move osixia/openldap to services section - because it should happily run as a service, rather than detached in the pipeline
2. Remove obsolete NEED_USER_MANAGEMENT_APP from .drone.yml because the separate user_management app is no longer maintained/valid since core stable10 became master

I am cleaning this up before converting to drone starlark, to make sure that these changes work.

[codecov]

Codecov Report

Merging #454 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #454   +/-   ##
=========================================
  Coverage     35.64%   35.64%           
  Complexity     1340     1340           
=========================================
  Files            31       31           
  Lines          3785     3785           
=========================================
  Hits           1349     1349           
  Misses         2436     2436

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