Add timeout to prevent cloudbase-init service being stuck in offline state

for long time.

This has not been committed upstream, but has been filed in launchpad:

--- cloudbase-init-0.9.9/cloudbaseinit/metadata/services/httpservice.py.orig 2016-09-06 14:29:04.416253079 +0000

+++ cloudbase-init-0.9.9/cloudbaseinit/metadata/services/httpservice.py 2016-09-06 14:39:14.807656387 +0000

@@ -58,7 +58,7 @@

def _get_response(self, req):

try:

- return request.urlopen(req)

+ return request.urlopen(req, timeout=1)

except error.HTTPError as ex:

if ex.code == 404:

raise base.NotExistingMetadataException()

--- cloudbase-init-0.9.9/cloudbaseinit/metadata/services/ec2service.py.orig 2016-09-06 14:29:11.956815039 +0000

+++ cloudbase-init-0.9.9/cloudbaseinit/metadata/services/ec2service.py 2016-09-06 14:40:09.253600964 +0000

@@ -60,7 +60,7 @@

def _get_response(self, req):

try:

- return request.urlopen(req)

+ return request.urlopen(req, timeout=1)

except error.HTTPError as ex:

if ex.code == 404:

raise base.NotExistingMetadataException()

--- cloudbase-init-0.9.9/cloudbaseinit/metadata/services/maasservice.py.orig 2016-09-06 14:29:26.753303424 +0000

+++ cloudbase-init-0.9.9/cloudbaseinit/metadata/services/maasservice.py 2016-09-06 14:40:40.454202962 +0000

@@ -79,7 +79,7 @@

def _get_response(self, req):

try:

- return request.urlopen(req)

+ return request.urlopen(req, timeout=1)

except error.HTTPError as ex:

if ex.code == 404:

raise base.NotExistingMetadataException()

--- cloudbase-init-0.9.9/cloudbaseinit/metadata/services/cloudstack.py.orig 2016-09-22 14:25:30.411026974 +0000

+++ cloudbase-init-0.9.9/cloudbaseinit/metadata/services/cloudstack.py 2016-09-22 14:26:29.615140081 +0000

@@ -90,7 +90,7 @@

"""Get content for received url."""

LOG.debug('Getting metadata from: %s', url)

request = urllib.request.Request(url, **kwargs)

- response = urllib.request.urlopen(request)

+ response = urllib.request.urlopen(request, timeout=1)

return response.read()

def _get_data(self, path):