Expose vmx_options (optional)

- used to set VM Options advanced configurations
usage:
```
cloud_properties:
  vmx_options:
    sched.mem.maxmemctl: "1330"
```

[#148036961](https://www.pivotaltracker.com/story/show/148036961)

Signed-off-by: Chris Dutra <[email protected]>

src/vsphere_cpi/lib/cloud/vsphere/vm_config.rb

@@ -98,6 +98,10 @@ def bosh_group
       end
     end
 
+    def vmx_options
+      vm_type['vmx_options'] || {}
+    end
+
     private
 
     def validate_drs_rules

src/vsphere_cpi/lib/cloud/vsphere/vm_creator.rb

@@ -73,9 +73,16 @@ def create(vm_config)
 
       replicated_stemcell_vm.fix_device_unit_numbers(config_spec.device_change)
 
-      @logger.info("Cloning vm: #{replicated_stemcell_vm} to #{vm_config.name}")
+      if vm_config.vmx_options.is_a?(Hash)
+        config_spec.extra_config = vm_config.vmx_options.keys.map { |key|
+          VimSdk::Vim::Option::OptionValue.new(key: key, value: vm_config.vmx_options[key])
+        }
+      else
+        raise "Unable to parse vmx options: 'vmx_options' is not a Hash"
+      end
 
       # Clone VM
+      @logger.info("Cloning vm: #{replicated_stemcell_vm} to #{vm_config.name}")
       created_vm_mob = @client.wait_for_task do
         @cpi.clone_vm(replicated_stemcell_vm.mob,
           vm_config.name,

src/vsphere_cpi/spec/integration/vmx_options_spec.rb

@@ -0,0 +1,73 @@
+require 'integration/spec_helper'
+
+describe 'vmx_options' do
+  let(:vmx_option_key) { 'some_key' }
+
+  let(:network_spec) do
+    {
+      'static' => {
+        'ip' => "169.254.#{rand(1..254)}.#{rand(4..254)}",
+        'netmask' => '255.255.254.0',
+        'cloud_properties' => {'name' => @vlan},
+        'default' => ['dns', 'gateway'],
+        'dns' => ['169.254.1.2'],
+        'gateway' => '169.254.1.3'
+      }
+    }
+  end
+
+  context 'when vmx_options are provided as a Hash' do
+    let(:vm_type) do
+      {
+        'ram' => 512,
+        'disk' => 2048,
+        'cpu' => 1,
+        'vmx_options' => {
+          vmx_option_key => 'some_value'
+        }
+      }
+    end
+
+    it 'can set the defined vmx_options as configuration properties' do
+      begin
+        vm_id = @cpi.create_vm(
+          'agent-007',
+          @stemcell_id,
+          vm_type,
+          network_spec
+        )
+        vm = @cpi.vm_provider.find(vm_id)
+
+        found_vmx_option = vm.mob.config.extra_config.find {|c| c.key == vmx_option_key}
+        expect(found_vmx_option).not_to be_nil
+        expect(found_vmx_option.value).to eq('some_value')
+      ensure
+        delete_vm(@cpi, vm_id)
+      end
+    end
+  end
+
+  context 'when vmx_options are NOT a Hash' do
+    let(:vm_type) do
+      {
+        'ram' => 512,
+        'disk' => 2048,
+        'cpu' => 1,
+        'vmx_options' => [
+          vmx_option_key => 'some_value'
+        ]
+      }
+    end
+
+    it 'can set the defined vmx_options as configuration properties' do
+      expect {
+        vm_id = @cpi.create_vm(
+          'agent-007',
+          @stemcell_id,
+          vm_type,
+          network_spec
+        )
+      }.to raise_error(/Unable to parse vmx options/)
+    end
+  end
+end

src/vsphere_cpi/spec/unit/cloud/vsphere/vm_config_spec.rb

@@ -686,5 +686,36 @@ module VSphereCloud
         end
       end
     end
+
+    describe '#vmx_options' do
+      context 'vmx_options are specified' do
+        let(:input) do
+          {
+            vm_type: {
+              'vmx_options' => {
+                'sched.mem.maxmemctl' => '0'
+              }
+            }
+          }
+        end
+
+        it 'should return the vmx_options' do
+          expect(vm_config.vmx_options).to eq({ 'sched.mem.maxmemctl' => '0' })
+        end
+      end
+
+      context 'vmx_options are NOT specified' do
+        let(:input) do
+          {
+            vm_type: {}
+          }
+        end
+
+        it 'should return empty hash' do
+          expect(vm_config.vmx_options).to eq({})
+        end
+      end
+
+    end
   end
 end