wrap boto.utils.get_instance_metadata to ensure non-lazy loading

newer versions of boto lazily load the metadata from the ec2
metadata service. Here, we:

1. Add a ec2_utils module that checks which version of boto is being used and
   under the right versions the metadata dictionary will be expanded.
2. Use this new ec2_utils module in the cloudstack and ec2
   datasources as there entrypoints into boto.
3. Add a dependency on python-pkg-resources (from pkg_resources import
   parse_version) to determine the boto version.

LP: #1068801

1 files changed, 3 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 5408a941..de1bcbff 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -23,6 +23,9 @@
  - Fix the merging of group configuration when that group configuration is a
    dict => members. [revno 707]
  - add yum_add_repo configuration module for adding additional yum repos
+ - work around the lazy loading of get_instance_metadata in boto >= 2.6.0
+   by fully walking the dictionary. (LP: #1068801)
+   Added dependency on distribute's python-pkg-resources
 0.7.0:
  - add a 'exception_cb' argument to 'wait_for_url'.  If provided, this
    method will be called back with the exception received and the message.