(MCO-311) Remove current directory from Ruby load path

Conflicts:
	bin/mc-call-agent
(MCO-346) - Fix Data plugin and Agent load ordering

In 2.5.0 the rewrite of the runnner class the load ordering of Data
plugins and Agents were changed around. This causes Data plugins that
depend on agents like for example activate_when{PluginManager['service_agent']}

This commit restores the order.
Merge pull request #197 from ploubser/bug/stable/MCO-346

(MCO-346) - Fix Data plugin and Agent load ordering
MCO-336 - update release notes and changelog for 2.5.2
(maint) Update release date
Merge pull request #4 from melissaanne/maint/update_notes_changelog

Maint/update notes changelog
Merge branch 'MCO-311/2.5.1/security_fixes' into stable

* MCO-311/2.5.1/security_fixes:
  (maint) Update release date
  MCO-336 - update release notes and changelog for 2.5.2
  (MCO-311) Remove current directory from Ruby load path
Merge branch 'stable'

* stable:
  (maint) Update release date
  MCO-336 - update release notes and changelog for 2.5.2
  (MCO-346) - Fix Data plugin and Agent load ordering
  (MCO-311) Remove current directory from Ruby load path