Updated whataremyips -> added try/catch block to prevent error related to known

netifaces issue:

https://bugs.launchpad.net/ubuntu/+source/netifaces/+bug/753009

Change-Id: I0f4ccdcf6d1655923d39ed44f4eb81203d3e525b

swift/common/utils.py

@@ -566,12 +566,15 @@ def whataremyips():
     """
     addresses = []
     for interface in netifaces.interfaces():
+        try:
             iface_data = netifaces.ifaddresses(interface)
             for family in iface_data:
                 if family not in (netifaces.AF_INET, netifaces.AF_INET6):
                     continue
                 for address in iface_data[family]:
                     addresses.append(address['addr'])
+        except ValueError:
+            pass
     return addresses