Looks like pyzmq failed to build due to missing libzmq headers. Maybe just replace stage-packages by build-packages? All of them are *-dev packages, which make more sense in the build stage.
Running setup.py bdist_wheel for pyzmq: finished with status 'error'
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build/temp.linux-s390x-3.5/scratch/vers.c:4:17: fatal error: zmq.h: No such file or directory