changed data types of task_arns_to_instance_info

[rulixxx]

removed not null enforcement for ip columns in postgres tables to allow ip and instance ids to be populated

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Raul seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[JonathanAquino-NextRoll]

@rulixxx Sorry it took so long to get to this. How does removing these enforcements allow ip and instance ids to be populated?