input: Write a python function to build a dictionary of host features from a list of features.
  assert build_host_feature_dict(["vmx"]) == {"vmx": capabilities.FEATURE_ON}
  assert build_host_feature_dict(["lahf_lm", "xtpr"]) == {"lahf_lm": capabilities.FEATURE_ON, "xtpr": capabilities.FEATURE_ON}
  assert build_host_feature_dict([]) == {}
output: def build_host_feature_dict(features):
      return {feature: capabilities.FEATURE_ON for feature in features}