Parse int values for WLC_SET_VAR command

Parse value parameter for WLC_SET_VAR if var is of integer type.
Type based on grepping linux driver sources for:
 - brcmf_fil_iovar_int_set
 - brcmf_fil_iovar_int_get
Merge pull request #2 from kanstrup/misc

Parse int values for WLC_SET_VAR command
Add support for event payload
Use two protocols to distinguish the direction of ioctls
Parse a few more ioctls
Add parsed flag

Add parsed flag to indicate that var data has been fully parsed. This
is used to mark rest of data (if any) as unused.
Parse set var curr_etheraddr
Parse set var mcast_list
Parse set var arp_hostip
Parse data from ioctls where data is of uint32 type