Set parameters for OpenDaylight ML2 driver

Now that https://review.openstack.org/#/c/85589/ is merged, the
OpenDaylight ML2 driver requires that url, username and password
parameters are set.

Change-Id: Iecbdd3275387bea145a5d274d359a15eceaee6b7
Closes-Bug: #1304226
Enabled non-root users to read nfs_shares.conf.

If you use the cinder NFS driver, it will create a file called
nfs_shares.conf, containing a list of NFS shares cinder can
use.  The file is created with 660 permissions and owned by
root:root.  When c-vol starts, it has problems reading
nfs_shares.conf, resulting in a "[Errno 13] Permission denied:
'/etc/cinder/nfs_shares.conf'".  This patch creates
nfs_shares.conf without using sudo, so c-vol can at least
read it.

Change-Id: Ifce2bd4b9ff2191445a1964c1ce09c823d096d68
Closes-Bug: #1297916
Merge "Enabled non-root users to read nfs_shares.conf."
Revert "Devstack support for Neutron VPNaaS"

This reverts commit 8450a92a4d0299fff89717e665ce31d54731d3f0.

Change-Id: I6dd0f44a1a57735de292bc4ed4eaa929dc308297
Merge "Set parameters for OpenDaylight ML2 driver"
Merge "Revert "Devstack support for Neutron VPNaaS""
Merge branch 'master' of github.com:openstack-dev/devstack