Feature Release - Cloud Services Registration and Patch Upgrades

• Add support for registering Controller with Avi Cloud Services by setting the register_controller variables
• Add support for patch upgrades on deployment with the avi_upgrade variable. The README has additional information about the parameters.
• Update README with information on avi-upgrade.yml and avi-cloud-services-registration.yml Ansible Day 1 plays.
• Misc updates for consistency across all Cloud modules
• Update Avi Cloud configuration to use IAM role if create_iam is set to true
• Update IAM policy json to latest recommended policy
• Update GSLB tasks and example
• Expose new Security control variables for customization - create_firewall_rules, firewall_controller_allow_source_range, firewall_controller_security_group_ids, firewall_se_data_rules