fix if cleartext authentication is used on HSRP in NX-OS

[SaschaSchwarzK]

When cleartext authentication is used the parser raises an exception:

raw:

Vlan650 - Group 650 (HSRP-V2) (IPv4)
  Local state is Active, priority 150 (Cfged 150), may preempt
    Forwarding threshold(for vPC), lower: 0 upper: 150
  Preemption Delay (Seconds) Reload:120
  Hellotime 3 sec, holdtime 10 sec
  Next hello sent in 1.486000 sec(s)
  Virtual IP address is 100.100.100.225 (Cfged)
  Active router is local
  Standby router is 100.100.100.227 , priority 100 expires in 8.224000 sec(s)
  Authentication text "cisco"
  Virtual mac address is 0000.0fff.f28a (Default MAC)
  1 state changes, last state change 1y36w
  IP redundancy name is hsrp-Vlan650-650 (default)

error message

    raise TextFSMError('State Error raised. Rule Line: %s. Input Line: %s'
textfsm.parser.TextFSMError: State Error raised. Rule Line: 55. Input Line:   Authentication text "cisco"

Command output is from Nexus9000 C93180YC-FX, NXOS version 9.3(3)

Although it is considered as bad practice to use unencrypted authentication, it is a valid configuration setting in NX-OS:

configuration guide l3_cli_nxos