Add support for vmware_esxi plugin (#163)

* Add support for vmware_esxi plugin

vmware_esxi Vagrant plugin does not support vmx parameter and exists with error.

This small change in vagrant.py fixes it.

* Update vagrant.py

Small optimization of vmware_esxi support

Author: Tualua

src/molecule_plugins/vagrant/modules/vagrant.py

@@ -261,6 +261,9 @@
       {% if instance.provider == "vsphere" %}
       {{ instance.provider | lower }}.memory_mb = {{ instance.memory }}
       {{ instance.provider | lower }}.cpu_count = {{ instance.cpus }}
+      {% elif instance.provider == 'vmware_esxi' %}
+      {{ instance.provider | lower }}.guest_memsize = {{ instance.memory }}
+      {{ instance.provider | lower }}.guest_numvcpus = {{ instance.cpus }}
       {% elif instance.provider.startswith('vmware_') %}
       {{ instance.provider | lower }}.vmx['memsize'] = {{ instance.memory }}
       {{ instance.provider | lower }}.vmx['numvcpus'] = {{ instance.cpus }}