fix regex to match xe/ge/et interfaces

[stianvi]

I need the regex to match all the following:

kwargs=vme
kwargs=xe-0/0/0
kwargs=fpx0
kwargs=me0.0

Current state don't match xe/ge/et itnerfaces due to forward slash not in the regex expression.

[stianvi]

See Juniper/py-junos-eznc#549

[stianvi]

before

$ cat get_interface_information-et-var.conf

protocol: operation-failed
error: device et-0 not found

after

$ cat get_interface_information-et.conf

Physical interface: et-0/1/0, Enabled, Physical link is Up
  Interface index: 183, SNMP ifIndex: 512