Remove deprecated --server-postflags argument

Change-Id: I54030337685cccea8d635f49b753fe0f93deb247
Add missing plugin load argument for CoProcessing full workflow

Change-Id: I4f2737136f2b555ddcb594867bc49de639525241
Merge topic 'add-test-plugin-option-v2' into next

fa9a9f7 Add missing plugin load argument for CoProcessing full workflow
995c6f0 Remove deprecated --server-postflags argument