MORPH-7516: Add addServerGroupServers plugin context method#135

MrClement wants to merge 2 commits intov1.4.xHewlettPackard/morpheus-plugin-core:v1.4.xfrom

MORPH-7516-cluster-add-nodeHewlettPackard/morpheus-plugin-core:MORPH-7516-cluster-add-nodeCopy head branch name to clipboard