Addition of LXD images breaks setting of KVM image in conf file

[Jeff Lane ]

Currently, this is the regex that sets the KVM image in the conf file on deployment:

filename_line=$(egrep "$DISTRIB_CODENAME-server-cloudimg-$arch.*img" /tmp/index.html | head -n 1);
if [ ! -z "$filename_line" ] ; then
    filename=$(echo $filename_line | grep -Po '(?<=href=")[^"]*(?=")');
else
    filename_line=$(egrep "server-cloudimg-$arch.*img" /tmp/index.html | head -n 1);
    filename=$(echo $filename_line | grep -Po '(?<=href=")[^"]*(?=")');
fi

However, that glob is too loose and now grabs the LXD images instead.

Need to modify this to grab the correct image for KVM
Need to modify this to also set the LXD image as well.