RHV: HostedEngine is down and will not start

Issue

• HostedEngine is down, cannot start it.
• HostedEngine start fails with:

2018-03-23 06:08:21,897+0000 ERROR (vm/d1992d92) [virt.vm] (vmId='d1992d92-cfcd-405a-806d-80fbf7da8953') The vm start process failed (vm:631)
Traceback (most recent call last):
  File "/usr/share/vdsm/virt/vm.py", line 562, in _startUnderlyingVm
    self._run()
  File "/usr/share/vdsm/virt/vm.py", line 2060, in _run
    self._connection.createXML(domxml, flags),
  File "/usr/lib/python2.7/site-packages/vdsm/libvirtconnection.py", line 123, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/utils.py", line 1006, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3567, in createXML
    if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self)
libvirtError: Network interface name 'another_network' is too long: Numerical result out of range