Ticket: CM-5900
Reviewed By: CCR-2921
Testing Done: Tested 'service networking stop' during system reboot and shutdown
this is cherry-pick of cumulus-3.2.y commit ac231e966a04eb78153d9b53f0d236a149c7bba5
Ticket: none
Reviewed By: roopa,satish
Testing Done: built, installed, verified correct location
The install file resulted in creating /etc/default/networking/ as a
directory and installing the networking.default file in it. Rename
networking.default to networking, and change the install file.
Normally dh_installinit handles all this, but since the package is
ifupdown2, and the file is networking, that doesn't happen.
Also, because we had created a directory with the name of what we want
to install as a file, we need to remove it if it exists. This addition
of a preinst file should not go upstream, and should be removed in a few
weeks when everybody has re-installed enough.
