Allow explict setting of vpc_security_groups to allow modification of security groups of RDS instances within a VPC
Merge branch 'fix_rds_modify_security_group' of https://github.com/mohangk/ansible into mohangk-fix_rds_modify_security_group
Merge branch 'mohangk-fix_rds_modify_security_group' into devel
Fixing usage string in ansible-galaxy install for role files