VTL: Fix issue with ipaddress library use under python2.
If you pass in a non-unicode 4-byte ipv6 address to ip_address,
ipaddress interprets this as an IPv4Address.
Under python2, ip_address interprets 'a7::' as a packed ipv4:
97.55.58.58
You can test with:
---
import ipaddress
try:
text_type = unicode
except NameError:
text_type = str
addr = ipaddress.ip_address('a7::')
print(addr)
---
Change-Id: I06c561e0ab7315869cc89d0bb08c05e743a90982
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>