Install some extra python packages #50

Job	Run time
lint	11s
docs / test	1m 4s
base-images	19m 20s
app-images (nightly, pulp-minimal)	19m 27s
app-images (nightly, pulp)	34m 54s
app-images (nightly, galaxy-minimal)	13m 9s
app-images (nightly, galaxy)	14m 29s
app-images (stable, pulp-minimal)	15m 11s
app-images (stable, pulp)	30m 7s
app-images (stable, galaxy-minimal)	11m 19s
app-images (stable, galaxy)	12m 49s
	2h 52m 0s

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