Some more tests for ldap plugin.
Introduce plugin version checking
Fix incorrectly ported Audit Trail page object
Do not diagnose failed assumptions
[FIXED JENKINS-23087] Respect installed plugin version
Stretch timeout in case we are using several cores
[FIXED JENKINS-23093][JENKINS-23087] Fixed WithPlugins annotation.
Now existing plugin will be overwritten with newer version if env var
NEVER_REPLACE_EXISTING_PLUGINS is not set.
Merge branch 'ldap' of https://github.com/eidottermihi/acceptance-test-harness