added ports for ServiceNow Discovery

[gogel001]

Per Ian, and INC000002819140. I believe i have the correct update in place.

[badra001]

Need to update;

• CHANGELOG.md (add text for 1.2.2)
• version.tf (change to 1.2.2)

Include in the changelog the two DNS names, IPs, reference ticket and any URL documentation (the stuff you shared with me)

[badra001]

To apply this across the board will take some time. You will need to test this in one VPC first, and make sure access works. To do that:

cd account/vpc/region/vpc
tf-init -upgrade
tf-plan
# make sure it's only changing the thing you are expecting
# a target plan may be needed here
tf-apply

[badra001]

Talk to me when it's in good shape and ready to be distributed everywhere.