Fix a missed portion of a pull request patch
Fix a missed portion of a pull request patch

This patch fixes:
    Workaround for a bug in CloudFormation and EC2 where the
    DestinationSecurityGroupId property is ignored causing
    egress rules targeting a security group to be ignored.
    Using SourceSecurityGroupId instead works fine even in
    egress rules. AWS have known about this bug for a while.

mannytoledo/troposphere,pas256/troposphere,horacio3/troposphere,inetCatapult/troposphere,LouTheBrew/troposphere,unravelin/troposphere,jantman/troposphere,cloudtools/troposphere,WeAreCloudar/troposphere,kid/troposphere,amosshapira/troposphere,jdc0589/troposphere,ccortezb/troposphere,ikben/troposphere,craigbruce/troposphere,cryptickp/troposphere,alonsodomin/troposphere,garnaat/troposphere,alonsodomin/troposphere,7digital/troposphere,mhahn/troposphere,johnctitus/troposphere,pas256/troposphere,dmm92/troposphere,xxxVxxx/troposphere,dmm92/troposphere,7digital/troposphere,wangqiang8511/troposphere,yxd-hde/troposphere,ptoraskar/troposphere,ikben/troposphere,Hons/troposphere,Yipit/troposphere,micahhausler/troposphere,horacio3/troposphere,johnctitus/troposphere,cloudtools/troposphere,samcrang/troposphere,DualSpark/troposphere,iblazevic/troposphere,nicolaka/troposphere