msg: fixed bugs with vlan pack
msg: fixed bugs with vlan pack

There was wrong len in vlan pack if we have mask

Signed-off-by: Stepanov Evgeniy <be3de3bd07bc0e6f7c7235242d1477827e7e64b3@arccn.ru>

ARCCN/libfluid_msg,ARCCN/libfluid_msg,ARCCN/libfluid_msg