Remove prepip #45

Job	Run time
lint	9s
docs / test	56s
base-images	18m 22s
app-images (nightly, pulp-minimal)	17m 13s
app-images (nightly, pulp)	32m 40s
app-images (nightly, galaxy-minimal)	12m 23s
app-images (nightly, galaxy)	13m 48s
app-images (stable, pulp-minimal)	1h 55m 57s
app-images (stable, pulp)	1h 0m 23s
app-images (stable, galaxy-minimal)	10m 32s
app-images (stable, galaxy)	11m 35s
	4h 53m 58s

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