The get_interfaces() speed crash with no IP address

[FloLaco]

The get_interfaces() function crash when a SVI does not have IP address.

Problem seen on Nexus N9K-C93180LC-EX
Driver : NXOS_SSH
Traceback :

Traceback (most recent call last):
  File "script_switch.py", line 308, in <module>
    main(sys.argv[1:])
  File "script_switch.py", line 303, in main
    test_migration(ip, login, pwd, driver, fex)
  File "script_switch.py", line 206, in test_migration
    new_intf_table = device.get_interfaces()
  File "/home/florian_lacommare/GitHub/napalm/napalm/nxos_ssh/nxos_ssh.py", line 862, in get_interfaces
    interfaces.update(parse_intf_section(entry))
  File "/home/florian_lacommare/GitHub/napalm/napalm/nxos_ssh/nxos_ssh.py", line 149, in parse_intf_section
    speed = int(match.group('speed'))
AttributeError: 'NoneType' object has no attribute 'group'

The interface that trigger the crash :

Vlan600 is up, line protocol is up, autostate enabled
  Hardware is EtherSVI, address is  6cb2.aeb5.9f59
  Description: *** L3VNI-PROD ***  MTU 9216 bytes, BW 1000000 Kbit, DLY 10 usec,
   reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not supported
  ARP type: ARPA
  Last clearing of "show interface" counters never
  L3 in Switched:
    ucast: 0 pkts, 0 bytes

As we see, the description part is on the same line as MTU/SPEED
And here is the regex for the speed : re_speed = r"^\s+MTU .*, BW (?P<speed>\S+) (?P<speed_unit>\S+), "

We just need to remove the regex "beginning of new line".
I'll provide a PR for that because there is some other issue with VXLAN

[dbarrosop]

Great, thanks for the report. Waiting for the PR :D

[FloLaco]

I'm going to be crazy with the cisco scrapping data ...
New N9K is different to N3K, N7K etc ... I've fixed the issue, I just need to continue my development for adding support to vxlan with N9K before creating the PR