Many of these were actually files containing the path to the real
script, instead of being symlinks.
config-{internal,external}.sh files in openvswitch/ovs-base were not
needed and were thus deleted.
Also update minimal-environment-vars.md after symlinks were fixed.
Change-Id: I11c3e735067b1feb83c3184c32333e598fbdf590
Closes-Bug: #1474227
9becd325cd