Remove prepip #42

Job	Run time
lint	8s
docs / test	43s
base-images	20m 7s
app-images (nightly, pulp-minimal)	18m 36s
app-images (nightly, pulp)	33m 34s
app-images (nightly, galaxy-minimal)	12m 23s
app-images (nightly, galaxy)	13m 51s
app-images (stable, pulp-minimal)	1h 25m 51s
app-images (stable, pulp)	1h 25m 51s
app-images (stable, galaxy-minimal)	10m 32s
app-images (stable, galaxy)	12m 24s
	4h 54m 0s

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