More debug for the interfaces up crash debug

.travis.yml

@@ -15,6 +15,7 @@ install:
   - pip install -rdev-requirements.txt
 
 script:
+    - ifconfig
     - py.test -v -s tests --cov gns3server --cov-report term-missing
 
 #branches:

gns3server/utils/interfaces.py

@@ -100,11 +100,13 @@ def is_interface_up(interface):
                     return True
             return False
         except OSError as e:
-            raise aiohttp.web.HTTPInternalServerError(text="Exception when checking if {} is up: {}".format(interface, e))
+            raise e
+            #raise aiohttp.web.HTTPInternalServerError(text="Exception when checking if {} is up: {}".format(interface, e))
     else:
-        #TODO: Windows & OSX support
+        # TODO: Windows & OSX support
         return True
 
+
 def interfaces():
     """
     Gets the network interfaces on this server.