Fix Junos SRX/MX, ios and nxos parsing issues

[claudiolor]

Description

This PR fixes a bunch of parsing issues:

• Junos (closes #803)

  • Handle Junos routes corner case
  • Handle Junos SRX show version correctly
  • Interfaces parser: handle /32 routes in SRX correctly
  • MAC Parser: Junos MX/SRX Fixes
  • VLAN Parser: Junos SRX/MX BD fixes
  • Interfaces Parser: Junos fixes .0 interfaces & internal ifaces
  • fix boot time parsing error log with junos

• ios

  • Handle unspecified native VLANs

• nxos

  • Set rrclient correctly

• testparsing*.py updates to account for these changes and a few more to account for valid Junos scenarios

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)