userspace/wrs_vlans: allow port ranges in dot-config, change delimiter from ':' to ';'

userspace/tools/wrs_vlans.c
Signed-off-by: Grzegorz Daniluk <grzegorz.daniluk@cern.ch>
the rest:
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>