Supporting Nuage Networks' Plugin through devstack

Nuage networks' plugin specific configuration setting file for devstack

Change-Id: I936f87b8fbc6f90130514b2fc0d111eab861da7c
Implements: blueprint nuage-networks-plugin
remove additional f18 references

f18 has been EOL for 6 weeks now, time to purge it from devstack

Change-Id: I5aac2c63b2f4cd8b01ae685b1acf4c188637558b
make git_clone safer

the ensures that if the function returns early, we return to a
sane directory, and not hang out somewhere that a future git
call might modify a directory in a weird way. This is especially
important in the case of stable branches where were are hopping
between stable for servers and master for clients.

Change-Id: Ib8ebbc23b1813bc1bfb31d0a079f1b882135bd39
change the vmdk to the one used in VMWare ci

The debian image that defaults to being using with vmware is huge,
and it turns out it's not actually used in VMWare ci so we don't
really know if it's working. Instead use the vmdk that is used
in VMWare ci, which we know will boot, as we get results everyday.

Change-Id: I014746af293852525e2bd128c4d19f5889ecd55d
Merge "remove additional f18 references"
Merge "make git_clone safer"
Merge "change the vmdk to the one used in VMWare ci"
Merge "Supporting Nuage Networks' Plugin through devstack"
Merge branch 'master' of https://github.com/openstack-dev/devstack