CF-4202597 - per-app mappings don't exist in REST CFCs

Issue: per-app mappings don't exist in REST CFCs

Steps to Reproduce:
1) unzip CF-4202597.zip (attached to ticket)
2) run index.cfm to register REST app
3) run mypage.cfm

Actual Result: coldfusion.xml.rpc.CFCInvocationException - Could not find the ColdFusion component or interface mymapping.myOtherCFC

Expected Result: "c"

4) In CF Admin, create "mymapping" mapping to unzipped app's directory
5) run mypage.cfm

Actual and Expected Result: "c"

Verified in build 2018.0.01.308605 (PreRelease).
Filed as CF-4202597.