So I've been trying to troubleshoot the exact same problem for the last 10 days without much luck. It appears to be a problem with the toolchain in kivy-ios and Xcode 7.3.1. I submitted a code-level support request with Apple and their only response was to contact the third party development group (kivy) regarding the issue because there isn't anything they can do really.
By the way, deleting the python library from "Copy Bundle Resources" would definitely make the app crash during Apple's review process, there's no doubt about it. The .so.o files are required shared libraries and deleting them would cause the same problem.
I'm afraid the only solution is to fix the toolchain to address these issues (someone correct me if I'm mistaken here). Specifically, the toolchain needs to be updated such that the app not only builds successfully in Xcode, but it also successfully validates and uploads to iTunes Connect.
Currently, building the app works and it even runs on my phone. I can even get the app to validate in most cases. However, the app cannot be uploaded to iTunes Connect and without this capability, an iOS app cannot be currently developed with kivy - this is a major issue and needs to be addressed.