Add MinAdjustmentType for autoscaling.

When policy_type is PercentChangeInCapacity, allows values of
min_adjustment_type, which set the AWS MinAdjustmentType value for
autoscaling policies.
Updated Opsworks for support AMI ID & configuration managers.
PEP8 fixes for EC2 MinAdjustmentStep
Merge branch 'opsworks-update' into develop
Revert "Added "lookup" and "new_item" to dynamodb2.table, which makes it more"

This reverts commit 0059db720e66981336f140e0a7b16e25d15b1cdc.
Added release notes for v2.9.9.
Bumping version to 2.9.9
Merge branch 'release-2.9.9' into develop

* release-2.9.9:
  Bumping version to 2.9.9
Added notes about merging pull requests.
Add unit tests for EC2 auto scaling policy MinAdjustmentStep
Added a failing test for set changes in DDBv2.
Altering how state tracking of ``Item`` data works in DDBv2.
update cacerts from mozilla.org

Used mk-ca-bundle.pl locally to generate a recent cacerts.txt file that
fixes https certificate validation for OSX 10.8x. These certs were built
with:

$ perl mk-ca-bundle.pl -w 64 boto/cacerts/cacerts.txt

fixes boto/boto#1535
closes jtriley/StarCluster#267
Added a failing test for CloudSearch's Layer2.
fix for https://github.com/boto/boto/issues/1629
Only include MinAdjustmentStep as a parameter if it has been set in order to prevent changing existing behavior; updated unit tests to show this behavior.
Merge remote-tracking branch 'taylordt/ec2-min-adjustment-type' into develop
Fixed the sending of empty data to DDB as well.
add DynamoDB ap-southeast-2 endpoint
Merge branch 'jtriley-update-cacerts' into develop

Closes # 1578.

* jtriley-update-cacerts:
  update cacerts from mozilla.org