Should intf.can_ext_tcvr_config expose a bitfield or parsed data?

[epage]

See http://zone.ni.com/reference/en-XX/help/372841L-01/nixnet/nxpropsession_intfcanexttcvrconfig/

[lilesj]

Customers rarely use external transceivers so we can leave it as a bit field for now.

[epage]

Customers rarely use external transceivers so we can leave it as a bit field for now.

So that aligns with scheduling it for a later milestone. This will need to be decided before we hit 1.0 though because changing it later will be a breaking change.

[jashnani]

Related #112