[BUG] esxi_host values aren't correctly used

[waynew]

Using a sample (new style) config:

saltext.vmware:
  host: host.example.com
  user: fnord
  password: my voice is my passport, verify me
  esxi_host:
    esxi.example.com:
      user: some_esxi_dude
      password: a totally different password

Running salt-call vmware_esxi.get_role View works, but salt-call vmware_esxi.get_role View esxi.example.com does not -- get_config is not
correctly getting the user/password from the esxi_host portion of the salt
config.