Kbit is not a valid speed representation

[dainok]

Environment

• netutils version: 1.17.2

Proposed Functionality

Support Kbit and Mb/s used by Catalyst show interfaces replacing bit and b/s with b.

Use Case

Catalyst interfaces use Kbit to display interface bandwidth:

Vlan1 is up, line protocol is up , Autostate Enabled
  Hardware is Ethernet SVI, address is 7061.7b0c.xxxx (bia 7061.7b0c.xxxx)
  MTU 9100 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255

GigabitEthernet1/0/2 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 4ce1.7668.xxxx (bia 4ce1.7668.xxxx)
  MTU 9100 bytes, BW 10000 Kbit/sec, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Mb/s, media type is 10/100/1000BaseTX