Mixed ABI installation with VMs and Bare Metal nodes fail with POST request timeout and EOF from agent container on Red Hat Openshift Container Platform 4

Issue

• The ABI installation fails with the below error from the Bare Metal node agent container:

next_step_runne[3037]: time="DD-MM-YYYY HH:MM:SS" level=warning msg="Error posting step reply: Post \"http://rendezvous-IP:8090/api/assisted-install/v2/infra-envs/237db513-114a-4889-91dd-2daba42e7a62/hosts/372df9ef-b72c-ffcc-7687-89d44f95dc36/instructions\": EOF" file="step_processor.go:87" request_id=144891e4-8b12-4078-a950-67a81525134d