Ben Nemec 3c2125c99a Add yum clean all when updating undercloud
As done in Iff559c70e1dc11b01b9e1954ee5170a2b4c7b724

Change-Id: Ic73d9cd3b62c4b12f39eb51d9f4bca051de11971
Closes-Bug: 1663579
2017-02-15 18:13:49 +00:00
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