Small change to allow passing security groups through to ec2_driver on create_instance

[Tobias Crawley]

This is a resubmission of my last patch, with the addition of the proper 
#declare_feature and #feature calls.

Tobias Crawley (1):
  Expose security_group feature for ec2.

 server/lib/deltacloud/base_driver/features.rb   |    8 ++++++++
 server/lib/deltacloud/drivers/ec2/ec2_driver.rb |    4 +++-
 2 files changed, 11 insertions(+), 1 deletions(-)

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1.7.2.3