In few places drop parameter of VLANs in dot-config was descibed that
can take different set of parameters, while the only accepted was y or n.
Now it can be y, yes, 1, n, no, 0. However, the tool (wrs_vlans) can use
only 1 or 0 for "drop" parameter.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>