Why does openvswitch fails to start with 'This system does not support "SSSE3"'

Issue

• After installing openvswitch-2.5.x openvswitch-nonetwork fails with :

# systemctl status openvswitch-nonetwork -l
● openvswitch-nonetwork.service - Open vSwitch Internal Unit
   Loaded: loaded (/usr/lib/systemd/system/openvswitch-nonetwork.service; static; vendor preset: disabled)
   Active: failed (Result: exit-code) since Sat 2016-12-31 00:28:01 EST; 5s ago
  Process: 27406 ExecStart=/usr/share/openvswitch/scripts/ovs-ctl start --system-id=random $OPTIONS (code=exited, status=1/FAILURE)
 Main PID: 27406 (code=exited, status=1/FAILURE)

Dec 31 00:28:01 instack.localdomain systemd[1]: Starting Open vSwitch Internal Unit...
Dec 31 00:28:01 instack.localdomain ovs-ctl[27406]: Starting ovsdb-server [  OK  ]
Dec 31 00:28:01 instack.localdomain ovs-ctl[27406]: ERROR: This system does not support "SSSE3".
Dec 31 00:28:01 instack.localdomain ovs-ctl[27406]: Please check that RTE_MACHINE is set correctly.
Dec 31 00:28:01 instack.localdomain ovs-ctl[27406]: Configuring Open vSwitch system IDs ovs-vsctl: ovs-version=: argument does not end in "=" followed by a value.
Dec 31 00:28:01 instack.localdomain systemd[1]: openvswitch-nonetwork.service: main process exited, code=exited, status=1/FAILURE
Dec 31 00:28:01 instack.localdomain ovs-ctl[27406]: [FAILED]
Dec 31 00:28:01 instack.localdomain systemd[1]: Failed to start Open vSwitch Internal Unit.
Dec 31 00:28:01 instack.localdomain systemd[1]: Unit openvswitch-nonetwork.service entered failed state.
Dec 31 00:28:01 instack.localdomain systemd[1]: openvswitch-nonetwork.service failed.

• openvswitch-2.5 based openvswitch services fail to start on older hardware .
• openvswitch-2.5 based openvswitch services fail to start on virtual machines .
• Red Hat Enterprise Virtualization host fails to start openvswitch .