Fixed the Instance Agent Interface IP to be set the the main IP discovered by the template to make sure that one an use the Discovered Host with a agent to monitor the VM.

Steps to reproduce:

1. Add and configure new AWS Discovery Host for AWS Account with EC2 instance
2. Link AWS by HTTP Template
3. Configure Macros to connect to account
4. Manually run the Discovery

Result:
See screenshot...

Expected:
See screenshot....

See pull request Corrected Agent Interface to correctly set IP and Name by riaano · Pull Request #131 · zabbix/zabbix (github.com)