[experimental] ci: bootstrap from beta instead of nightly#3650

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matthiaskrgr wants to merge 2 commits intorust-lang:masterfrom

matthiaskrgr:ci_from_beta

Commits on Jan 10, 2019

ci: bootstrap from beta instead of nightly since a lot of nightlies have been missing lately.
matthiaskrgr
committed
base-tests.sh: update to use beta instead of nightly
matthiaskrgr
committed