Logan V f63abfa921 Use consistent apt options for upgrades
The 'apt-get upgrade' does not set confdef and confold currently, so an
upgrade which requires user input can break the cache build[1].

[1] http://paste.openstack.org/raw/733076/

Change-Id: Ic6689387a28539b7eb341d55a9db08f078e8e975
2018-10-25 14:58:12 -05:00
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