Hyper-V: Ensure default switch name is always wrapped in quotes

[stuartpreston]

Signed-off-by: Stuart Preston [email protected]

On a Windows 10 (build 16299) machine, the name of the default Hyper-V switch is Default Switch. If the switch is specified in the .kitchen.yml as per the documentation (see below example) then there is no issue with the generated Vagrantfile:

  network:
  - ["public_network", bridge: "Default Switch"]

However, when the default configuration is used without specifying the above, the following entry is generated in the Vagrantfile:

c.vm.network(:public_network, bridge: Default Switch)

In turn this leads to Vagrant not being able to validate the file correctly, returning the following error:

Vagrantfile:6: syntax error, unexpected tCONSTANT, expecting keyword_do or '{' or '('
       etwork, bridge: Default Switch)
                              ^
Vagrantfile:15: syntax error, unexpected keyword_end, expecting end-of-input

This PR ensures that any default switch name returned from the system is wrapped in quotes, generating a valid Vagrantfile.