Fix new-style device naming from Network Manager on RHEL/CentOS 7

[legal90]

Fixes #388 and Parallels/vagrant-parallels#265
Details about the root of issue: Parallels/vagrant-parallels#265 (comment)

The solution has been taken from Boxcutter: boxcutter/centos@be4174e

It might look not very clear, so any other solutions are welcome. The current implementation does the following (only on RHEL/CentOS 7):

• Cleans up the NetworkManager state and settings before the box packaging
• Appends /etc/rc.d/rc.local by the script, which fixes names of network devices in NM configuration
• Being executed only on the first boot, the script mentioned above removes itself from the /etc/rc.d/rc.local.

I've verified it with centos-7.2-x86_64.json template and parallels provider

[yankcrime]

👍 For this - have tested using VMware Fusion and it solves the issue as described.

[nabheet]

I have validated that this fix resolves the issue that I discovered with vagrant getting stuck on setting hostname while bringing up a CentOS 7.2 VM using the Parallels provider.

Basically, I can confirm that this is true: I've verified it with centos-7.2-x86_64.json template and parallels provider.

Hopefully this will be merged soon.

[legal90]

@cheeseplus @rickard-von-essen @yzl We need your LGTMs to merge this patch :)

[cheeseplus]

+1