One more piece of information in this context as per Irena Berezovsky (I validated it):
"if you wish to create VMs with only SR-IOV vNICs, there is no need to install openvswitch agent on compute nodes. There is no relationship between the two agents or mechanism drivers. The openvswithc or linux bridge agent
(depends on chosed Mechanism Driver) should be installed on Network Node to enable L3 and DHCP services."