Allow trusted_networks as both string or array

[bheuvel]

Has advantages of #113 while also keeping configfiles (Vagrant, Test-Kitchen) backward compatible.

[bheuvel]

Test result from Windows host; all green, except rsync test (as expected)

Running RSpec tests in folder : vmlifecycle
Using Vagrant file            : Vagrantfile.advanced_networking

VM Life Cycle
  starts Linux and Windows VM
  destroys Linux and Windows VM

Finished in 2 minutes 59.2 seconds (files took 0.125 seconds to load)
2 examples, 0 failures

Running RSpec tests in folder : networking
Using Vagrant file            : Vagrantfile.advanced_networking

Networking features
  creates firewall and portwarding rules

Finished in 3 minutes 6.3 seconds (files took 0.121 seconds to load)
1 example, 0 failures

Running RSpec tests in folder : rsync
Using Vagrant file            : Vagrantfile.advanced_networking

VM RSync
There was an error when attempting to rsync a synced folder.
Please inspect the error message below for more info.

[miguelaferreira]

I get the same results:

Running RSpec tests in folder : vmlifecycle
Using Vagrant file            : Vagrantfile.advanced_networking

VM Life Cycle
  starts Linux and Windows VM
  destroys Linux and Windows VM

Finished in 3 minutes 56.5 seconds (files took 0.14185 seconds to load)
2 examples, 0 failures

Running RSpec tests in folder : networking
Using Vagrant file            : Vagrantfile.advanced_networking

Networking features
  creates firewall and portwarding rules

Finished in 4 minutes 22.7 seconds (files took 0.10225 seconds to load)
1 example, 0 failures

Running RSpec tests in folder : rsync
Using Vagrant file            : Vagrantfile.advanced_networking

VM RSync
Connection to 31.22.84.56 closed.
  does rsync to the VM

Finished in 1 minute 4.78 seconds (files took 0.08991 seconds to load)
1 example, 0 failures

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