NEXUS-6591: Open up LDAP plugin

Changes:
* SSL plugin OSSed
* LDAP plugin OSSEd
* "legacy" OSS LDAP plugin removed
* common-ldap module imploded into ldap plugin

Packages are still left as "com." but GAVs
adjusted to "org."
NEXUS-6591: Tests fall in, module completely removed
NEXUS-6591: Needed for tests to keep'em happy
Update comment
NEXUS-6591: Added modern ITs
NEXUS-6591: Fall in legacy ITs
Merge remote-tracking branch 'origin/master' into NEXUS-6591-open-up-ldap
NEXUS-6591: Moved DTOs out of plugin
NEXUS-6591: remove old plugin ITs

I tried to salvage them, but the use cases and the
REST API -- while similar as they spun off same model --
diverged in way that the ITs are not fit to Pro LDAP

Also, Pro ITs basically test the Pro LDAP plugin
while these were testing the OSS, now removed plugin.

In behaviour, again, are similar, but there are differences
in edge cases (ie. no config).

Not worth the time
NEXUS-6591: Fix import

After moving out DTOs this import change was left out
NEXUS-6591: More test cleanup
Merge remote-tracking branch 'origin/master' into NEXUS-6591-open-up-ldap
NEXUS-6591: Remove obsolete tests

will be more...
NEXUS-6591: Ported changes to goodies-ssl

FTR
https://github.com/sonatype/sisu-goodies/commit/3cd2b101e477f5dc287ef3ca33440636f0200148

Stuff moved out from internal package as it's part of API
NEXUS-6591: Remove obsolete parts

OSS config "framework" is ditched now
NEXUS-6591: Fix problem NEXUS-6652
NEXUS-6591: Align ream name and component name

Basically same as for NEXUS-6479
NEXUS-6591: Test tweaks

As these are OSS tests/cruft that never ran against Pro LDAP plugimn
Merge remote-tracking branch 'origin/master' into NEXUS-6591-open-up-ldap
NEXUS-6591: Adding ssl plugin to bundles