/** \brief DHCP Client config add / del request
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
@param sw_if_index - index of the interface for DHCP client
@param hostname - hostname
/** \brief DHCP Client config add / del request
@param client_index - opaque cookie to identify the sender
@param context - sender context, to match reply w/ request
@param sw_if_index - index of the interface for DHCP client
@param hostname - hostname